(Jim types faster than me and said it all already)
I don't think any of those users on KVR have Biab ???
Though if Biab was a vst also then sure you would not need ReWire but
PG seems to avoid things that are hard to do like 64bit, modernization and identical cross-platform development for a once a year release of the same Mac & Win version app, so I'm just looking at the easiest alternative for them.
Maybe the easiest way for PG is to fix it so the ReWireVST works as mentioned above http://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=371691