I am also testing out Patchwork again right now, so far no GUI problems! So perhaps those have been fixed since last year...which would have been BlueCatAudio fix, VePro7 hasn't been updated in quite a while.. Please let us know if you have any issues with it as you get further into it.
I vaguely recall it had something to do with hosting plugins inside Patchworks when patchworks is inside VePro..the sub-sub-hosted plugins would have problem...but so far so good today! and good to know.
That being said, I don't think you will be able to get midi into patchwork/Vepro from IAC regardless.
The main point about PlogueBidule is that it has an IAC module that DOES work. So you could setup PlobueBidule as AudioFX...and inside PlogueBidule, use the IAC module to get midi from totally outside of VePro. If you are going to use VePro.