Working with ACW will introduce tempo changes in a lot of bars. Take a look here:

https://www.youtube.com/watch?v=ENaN1cFu-9Q#t=3m25s

(Small red lines on each bars mens tempo changes in that example)

I can't see how this method could work with any VST host.

If ACW would use some kind of elastic audio algorithm (like Reaper, for example) instead of this method, things would be different (and better).

On the other hand, there's still a lot of work to do in the new ACW, so in my opinion a VST would be, in my opinion, premature.

Latest BIAB version, latest build.