You don't really need to drag buses into a Track. Essentially, a track already
is a bus; that's how Take Lanes work...the Lanes bus into the track. Put the two snare tracks in Take Lanes and whatever FX are in the track, including ProChannel, will process both tracks. (You may need to lower the lane levels via the track Gain control so when added together, they don't overload the inputs of the track FX.)
If one of the tracks needs to have its phase reversed (or for that matter, be processed independently with any effect), insert Channel Tools as a clip FX into the Take. The only significant limitation using Take Lanes compared to feeding individual tracks into a bus is you cannot automate Take Lanes separately. Any automation applied to the Track affects all Take Lanes. Then again, that may be exactly what you want if you don't want to copy multiple lanes of automation to various tracks.
However, as scook's link describes in more detail, you can also use conventional tracks with a bus, then send the bus output into a track via sidechaining and monitor only the sidechain input. The bus output appears just like a track, and is in the track view. Then you can hide the bus and even the source tracks if all you want is a single track that represents the output of source tracks going through a bus. It's not hard to set up, but you can always create a Track Template for this and load it as needed.