MIDI translation before messages reach Sonar

I tried this a while ago and failed but would like to pursue this again, so I ask for ideas / suggestions :-)
 
Is there a simple, reliable and affordable MIDI tool out there which could do MIDI translation before messages reach Sonar?
 
I would like to translate two button press actions on a MIDI controller (e.g. ALT + TRACK i.e. a combination without any pre-defined action) which actually result in 4 MIDI message (first ALT key on and off, then TRACK key on and off) into one MIDI message (or key stroke combination) which I could use for key bindings of available Sonar actions.
 
I tried BOME MIDI translator and could sort of get it to work for one button combination, but found it awefully complicated and not maintainable in a complex setup. Is there anything else I ould try?
 
I actually put a feature request up for discussion (http://forum.cakewalk.com/FindPost/3181813) but I'm afraid not many will care about such specific functionality ...

Hi azslow,
 
I've been following your posts, but until now only had quick glances at your site. Now I did more reading and think it is pretty impressive what you are trying to accomplish and if you have enough endurance to get this to a rock solid state, Sonar users with all sorts of controllers will love you :-)
 
Now back to my original post: I definitely want to continue using the vs-700 as it works now (as I'm very happy with it); I would only like some additional key press combinations on the surface to trigger currently unmapped actions, which means the vs-700 has to remain connected using the official controller set-up that came with Sonar ...
 
So could I use/configure your plug-in in conjuction with the vs-700 plug-in (both would be listening to the same MIDI port), the vs-700 should respond as usual and only the superfluous MIDI messages that the vs-700 does not understand/respond can be processed by your plug???