I'm kinda wary of trying that in an already broken Plane. Sure, it would avoid damaging the Material Plane, but it seems like we'd be inviting a whole other kind of trouble. Attracting attention from various forces battling there, accelerating the entropic decay of the area, sparking off wierd ass Wild Magic effects, etc.
For my plan to Summon Brimorak Demons, our normal Snare should be fine, since they're the Abyssal equivalent to dryer lint and it's only about 100 of them per day, but
@egoo's focused Super Summoning Funtime Extravaganza might need special considerations since it will be Summoning so many Outsiders in such a short period of time.
What about creating a temporary
Greater Demiplane. We create it, then cast the spell several additional times to add features, specifically Enhanced and Impeded Magic, no gravity, Alignment traits, etc. We can make it where the magic of the Summoned creatures is either nonfunctional or impeded, some of ours is enhanced, inflict penalties on them due to Alignment conflicts, and trap them floating helpless in the middle of the Summon Circle if they don't have innate flight abilities. That would of course be in addition to the other effects we would apply, such as Forbiddance, Hallow, etc.
And then when our folks are done, then dismiss the Demiplane and head home. If something starts to go wrong beforehand, they can just abandon the Demiplane and start up again later in a new one.
