Looking at the Stages specs right now...I think that may well be your best option for multiple envelopes. I think several 2 hp ADSRs might be a good idea, however, simply for the VCA contours over the Praga to get your final dynamic shaping prior to the output chain. Looking at the second build above, I see six VCAs outside of the Praga...using the Stages as a one-shot (or some multiple EG configuration) should be able to feed most or all of those properly, leaving only the Praga's channel VCAs.

You need 8 hp. If you were to drop the Erica Voice and Mod, and one Disting, that would give 10. So, four ADSRs, then replace the Mod with either an AD or another ADSR so you actually get that function back...that might button this thing up!