Using the piezo electronics with transducers

I'm not a fan of the sound of under the saddle peizos, and the ugly plastic electronics boxes that are cut into the body. But with limited options for acoustic bass guitars here, when I stumbled on a Takamine with a piezo, and went for it. It's handy having it, most often I never plug it in and it just a tuner (the battery went abut a year ago and it's telling that I haven't bothered investing in a rechargeable yet). I added tapewound stings and it sound lovely, and although smoother than rounds s less obvious sliding nose, there is a little that I don't like and the the under the saddle seams to picks this up quite well.
 
I've just bought a Guild that unusually came with a sound hole pick-up built in (so no plastic box), and I am loving it's pick-up sound. So I m back to wondering about a different solution for my ABG. Soundhole pick-up for ABG dn't seem to exist, I've had a look to see if Dog-ear pickups are available for Hollow bodied electric basses, to adapt, but it seems this transducer option may be the way to go.
 
http://kksound.com/products/purebass.php
 
If I pull out the old under the saddle, I'm left with a hole I can only think of covering with some tortoise shell pick-guard plastic. But I think I should just leave it in. My options seem to be.
 
1. Remove the peizo's output jack, and replace with the transducers. Leaving the electronics as just a tuner.
2. Add a second output hole, which I am reluctant to do, as adding more holes seems a step backwards, but would increase flexiblity. 
3. Is really the motivation to post a question. Can I wire the Transducer into the existing electronics designed for the piezo? The Transducer is said t be a lower output, but surely higher than the piezo's as it requires the pre-amp. This would give me the pre-amp, EQ and a tuner and a different sound. 
 
 

This is for a bass, so it's not so 'quacky' as such. I'm looking t get the Bass itself closer to what I want, than resort to software.   My new Guild is a small bodied bodied guitar, but has a soundhole humbucker so no worries there.
 
Maybe my post was too long, but do you have any thoughts on
"3. Is really the motivation to post a question. Can I wire the Transducer into the existing electronics designed for the piezo? The Transducer is said to be a lower output, but surely higher than the piezo's as it requires the pre-amp. This would give me the pre-amp, EQ and a tuner and a different sound. "
 
Since writing the post found the Jack plug out has 3 small holding screws, So if the K&K can't use this, then maybe I should just opt for option 2 (add a second output hole). But some reviews of the 'K&K Pure mini' say it's better with a preamp, so I'm still wondering if the 'K&K pure' will; benefit from using the existing Piezo's preamp, saving me touching the output jack. of course  I can just try it when it comes, but I'm just checking if anyone know if it's advisable.  
 
 

FWIW, Before modding the bass (sorry I missed that the first time), you might want to take it to a music store that has a Fishman Aura (small hardware preamp that will do similar to what I mentioned above).
 
https://www.fishman.com/products/series/aura/aura-spectrum-di-preamp/
 

I’d suggest leaving the undersaddle piezo strip where it is. They are surprisingly easy to damage, and the damage is often undetectable until they’re refitted. Another problem is that undersaddle piezos rely on the pressure applied to them by each string and the base of the saddle slot to be correct and properly balanced. Otherwise their response to each string can vary a lot.

Another reason to leave it in is that removing it will lower the saddle height and change the break angle of the strings as they pass over the saddle to the anchor points in the bridge. If the action or break angle ends up too low that means making a new saddle.

Sometimes the manufacturer hasn’t fitted the strip properly or the base of the saddle and slot need fine adjustment to get them to work at their best, but that’s not the sort of thing to explain in a forum post, or to attempt unless you’re confident about your woodworking ability.

Piezos usually benefit from being run into a compressor and a decent equaliser that’s more adjustable than the built-in preamps - and this can compensate for a lot of issues with them. I suggest running the piezo into the DAW and experimenting with compression and eq to see if it can be made to sound better. If it can, that’s fine unless you need to use the bass live, in which case a compressor pedal (preferably not an MXR or Keeley where bass is concerned) and a graphic eq pedal can often work wonders.

Jim Roseberry
You can run a piezo equipped guitar thru a "body resonance" IR... and it does *wonders* for the sound.
Gets rid of that quacky/smacky sound... and sounds a whole lot more like an acoustic guitar.
 
There's a free collection of Taylor "body resonance" IRs (mic'd with several different mic options).
You can download those... and use a convolution plugin to load one and play thru it.
 

Thanks for this suggestion Jim. I had never considered trying this before.
 
Quick updte: Rather nice... there are seven Taylor IRs in the third link in the second post in this thread on the Line 6 forums.
 
Sorry for the derail there Scott, I had to try that suggestion out.