While searching the inter-webs I stumbled upon this cool hack. Had no idea that someone actually started a service based on DIY Perks findings! From the people that have tested this solution, they have been reporting 2-3x the performance out the R5.
Canon R5 Heatsink Overheating Mod Service – Kolari Vision
Modify your Canon R5 for extended shooting time before overheating, and improved cool down times.
kolarivision.com