I spent some time and put this theory to the test on the workbench today. I was able to parallel everything up and get the BARC/Benedini working in tandem with my Tamiya electronics. Cannon, elevation sounds, turret rotation and everything worked seamlessly. I just unplugged the speaker for the Tamiya electronics and plugged it into the Benedini.

What I haven't tested is the battle system yet. I am building a Sherman and will use this set up in that, I can then comment on how the IR works. The issue is getting the hit and destroy sounds to play correctly. I don't think this will be an issue, but until I actually have it working I don't want to jump the gun and say it will.