Doesn't seem necessary , especially as the R1 is probably stills focused (R5 doesn't overheat with stills) and will have 2 processors and 2 CF express slots like 1DXiii and large body . I think it will have any overheating issues at all.--
All Canon needs to do is put in a BIG high nickel content stainless steel plate on the bottom of the R1 that will act as the out-to-air thermal output of a BIG Internal Heat Sink for the internal high-heat-producing CPUs and RAM memory of the camera to give it a full non-overheating 12-to-16 hour shooting day typical of news reporting and sports/action workloads!
If Canon does that along with 60 fps fps DCI 8K 8192 x 4320 pixel video capture and 30 fps Burst rate Full-Size 3:2 stills, the R1 will be a total PRO-CAMERA category winner!
Also stainless steel is a very poor heat conductor compared with aluminium , copper or even magnesium which would make much effective heatsinks.
Even just leaving the rear of the magnesium body exposed (behind the flippy screen) would help heat dissipation enormously but again unnecessary I think