as you said…
“send “the ch’s” to mix 9-10 (i.e.) post-fader mode. And using a pair of XLR to TRS cable, connect it to st2.”
that would be the workaround. But personally, I would never want one compressor on all the drums. Compress each drum channel as needed. So you want the drums to compress but not the reverb that is applied to them? If you raise the kick channel’s fader and it is now louder than all the other drums,… and hits the threshold of your “inserted” compressor, all the other drums are going to pump with each kick, completely un-musical, but if that is what you prefer, there is no law against it 🙂
I know I know,, a million youtube experts tell everyone that you must have a compressor on all your drums to “glue them together”
puhleeze. Trust YOUR ears