In a Canon ecosystem (stills I might add), I'm being tasked for more video work. Pick up a Canon R5C or a Blackmagic Pocket Cinema Camera 6K Pro?

Basically what the title says. I'm mainly a stills fashion photographer but am now being hired to do more video work. Mainly slo-mo people type stuff or architectural slo-mo. My current kit is basially an R5 with a DJI RS3 Pro and some edelkrone sliders and mounts for my video work. When doing still photography, I primarily use my R5 and have an R6 as backup, BTS camera.

I do love the 4k/120 on the R5 and it's buttery smooth when on a gimble but I don't like to take it off, etc to grab stills which means I'm using the R6 for my stills when I'm on set. That being said, I don't want to sacrifice the image quality so was thinking of either selling the R6 and upgrading to a R5C as a video/2nd stills camera. I could do that or keep the R6 and try to grab a Blackmagic Pocket Cinema Camera 6K Pro. It would be a bit of a learning curve not having autofocus, especially working with models walking around but I do like the built in ND filters. The R5C is notorious for crappy battery life but some onboard external battery could resolve that.

So, my studio is sitting with about 8 EF mount lenses, what would you do?