I don't know what you mean by VST (that plugin format is not supported by Mac BIAB), but here is a standalone program to do what you want. You can use this to send MIDI notes through the IAC bus to BIAB. It's a bit old, but works well here, hopefully this helps.
http://www.versiontracker.com/dyn/moreinfo/macosx/16702

- Jay

MacPro 5,1/12 core@3.46GHz -- OS X 10.15.7 -- ATI 7970 -- 32 Gig RAM -- Crucial 500GB OS SSD -- Samsung EVO 1TB Audio/Sample SSD -- BIAB 2024 -- Logic Pro X -- Cubase Elements 14 -- Too many plugins