You’re certainly welcome to cross-port OP_CAT and OP_CHECKSIGFROMSTACK to inquisition; I’m skeptical that it’ll be reasonably feasible to do anything useful with them in script (as opposed to handwaving on a blog / mailing list), but I’d love to be proved wrong. Could specify the behaviour on the wiki (eg Relay Policies · bitcoin-inquisition/bitcoin Wiki · GitHub) if you didn’t want to write up a proper BIP yet.
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