How about if not built into Capture, a standalone rack app for routing live signal / aux sends through VST.
I was mentioning Capture as it would be great to be able to open 1 app for recording as well as routing VST without fuss since it is already accepting the signal
it would mean less hassle than using studio one as in a live environment there is a greater risk of catastrophic results when doing things on the fly, like major feedback loops.
Maybe I failed to articulate the reason on the original post.