Dan, you probably were not following "VST>VST" EZkeys thread in "Recording" closely. I have mentioned this:

"EZkeys, while tailored for their "own" synths, as a program itself is just a fancy and convenient arpeggiator/phrase player with bunch of other features.
So... You can use MIDI phrases in EZkeys that were meant for completely different instruments (Strings, flutes, etc.) and since it has MIDI OUT function, you can hook it up to any other VST that has these Strings, flutes, etc. And you will get completely new usage out of EZkeys."

This will work in BIAB by dragging out timeline from EZkeys to empty track and re-voicing with any other VST of choice.
But a better way would be to have EZkeys MIDI "out" send data directly to synth of choice. Unfortunately this is not available yet in BIAB. (*Having a conversation with my self)

If I understood intentions correctly, Musocity "suggestion", has to do with EZkeys VS RC. Which is not a bad conversation, just doesn't seem to fit the theme of this thread.