It's probably far too late for this, but the best solution for long high bit-rate record times is a dedicated heat sink. I think Canon might be better served in the long run by bringing two variants to market. Keep the weather sealed R5 and R6 as they are now with their modest recording times and market those to stills photographers. And then release video modified versions (RV5 and RV6 if you will) with a redesigned back to accommodate a vented heat sink (and fan possibly). The rear of the camera would probably look like the monstrously ugly Fuji GFX-50S, but it would certainly take care of the overheating issue.
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