Mike,
Another applicational issue worth mentioning is that if your existing non-display remote control is high on the coaming outside of the dash, this can be a mounting challenge for some larger display remote controls and its harder to read a display remote so far off axis. You could flush the two Kicker level controls in a switch panel of sorts in the factory remote control position and then find a better location for the new display remote control, underdash for example.

David
Earmark Marine