EDACS in PRO-97
I agree with everthing hiegtx posted. In addition keep in mind that unless you want to hear "everything", each system would also have to have its own unique Talkgroup IDs.
However, in thinking this over, why is it such a big deal to FORCE two EDACS systems into ONE bank? You've got 10 banks - and surely you do not have 10 trunked radio systems programmed. I've got 2 MO systems (each in separate banks) and an EDACS system (for when I travel to that area) in another bank which is shared with conventional frequencies. In other words, you are better off to program 2 separate banks, with 1 EDACS in each, and fill it out with related conventional frequencies.
Good luck