If you could have a Plug-in Mode the same as RapidComposer or Fl Studio where the VSTi is just an small dll interface to the main app sending sync play/stop/loop/continue and receiving audio and midi from the main app.
This maybe an alternative if you can't get ReWire to work or the ReWireVST audio sorted, it would also give those who are well used to the main version all it's features.
Even if you can just get the sync to work you can use ReaStream to send audio/midi.

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