RUNNING MTH ENGINES WITH PROTOSOUND AND PROTOSOUND 2 WITH LIONEL ZW-L TRANSFORMER

The BCRs should have no influence on the ability of using a ZW-L to control PS1 and PS2 locos, which will be in conventional mode, of course.

PS-1 locos are conventional only. Given that you have a DCS system, is there any reason you don't want to use that for both PS1 and PS2 locos? PS-2 in command mode. PS-1 on the variable channels.