Today morning arrived the receiving confirmation from Gates support of yesterdays request, but no answers so far.
(Perhaps we’ve caused some headache there.)
However - here’s an image for you to explain the principle of a possible solution.
Imagine the green circle as an additional, small idle roller to guide the belt “around the corner”.
Logically there would be a longer belt required (red line).
Of course you’re right; that is still like prototyping - or one could say that is customization on a fairly high level.
Solving all problems in theory only seems impossible, many details must be checked “live”, on a real bike.