Hi Stephan - have a read up on the new ‘Direct Routing’ facility introduced at C8. Not at my machine for now, and not entirely sure of all its capabilities, but it allows routing to several destinations at once. So, if you set up one ‘dummy’ mono output in the VST Connections, add the DR (pointing to the dummy out) to those tracks you want as mono and batch export (choosing the dummy output).
This should save having to fuss with re-routing and/or setting the mono downmix in the Export Dialog, then re-routing back to how you had things, etc…
(Just thought, different routing in/outputs would be a neat addition to Track Versions capabilities…)
Anyway, I think I’ve got that right… I may have missed a detail or two… please, don’t shoot me…!
It might help…
Good luck,
Bob