Hi Paul,
It does not seem to be a Revit capability but I am wondering if it would be possible for you to somehow combine the walk-through and solar animation functions for Octane? So a 'hack' I guess would be to have the same amount of frames for both and then toggle them - something like animation frame moves / solar frame moves / render (?)
Long shot I know but it would be a great function!
Best,
Seeker