Patchwork is good, don't know if it will load a Win VST in Mac, haven't tried it on the Mac yet.
Biab lacks things that other audio apps have so I try to find free workarounds to solve these problems otherwise you end up spending too much. Like I just had to buy the ReWire VST that wasn't a freebie but the MiniHost and midiOut to midi clock sync Biab to another app are free.