not 100% sure how dirty it is to bring up Lifeweb: Theater of Pain around here, but, what the h, i'm gonna do it.
how it worked on Lifeweb: Theater of Pain was that the changeling absorbed people and left behind a huge, nasty sack filled with amniotic fluid. you could not move the sack. the sack grew out of the drained husk that the changeling left behind.
what made this "cool" and possibly "good" was that after a handful of minutes, a changeling copy of the guy/gal who got drained would pop out of the sack. gross wet schlorping sounds. gross. and they could keep playing... as an evil alien doppelganger.
this solves the "I have been murdered twenty minutes into the round and now I must sit and watch" problem. i do not know if it would solve the "The changelings inevitably end up 'going loud' (note: I hate this term. I also hate the terms "murderbone" and "chucklefucking") and slaying people/getting slain!" problem. that seems more structural, i.e, well you're giving me the ability to grow an awesome [PROTOTYPE] style Alex Mercer arm blade. why wouldn't i use the awesome arm blade.
keep in mind that i am 1) genuinely not that smart 2) chronically ill/in pain in case this post is incoherent. but:
you can easily solve the "I've been murdered early into the two to three hour round" problem by changing it from The Thing into Invasion of the Body Snatchers, i.e, by allowing changeling victims to come back as evil alien doppelgangers of themselves. "bob went missing 15 minutes ago... wait, there he is, but hes acting weird... why does he want me to check out this cool maintenance tunnel with him???"
the issue with changelings basically not being stealthy and fighting the security team probably has a lot to do with the abilities they're given. why do they have arm blades?? thats like if you gave every traitor an energy sword and got surprised when nine out of ten times they end up using it.
thanks for reading.