I don't know the f# of your 135L lens, but I hope Canon comes out with a RF 135mm f2 (or f1.8)L IS lens in the near future. I'd love to have a fast 135mm lens, but I also want it to be reasonable to hold and carry around which is why I'd prefer the 67mm aperture of the f2 most, while I'd accept the 75mm aperture of the f1.8. While I could afford the cost, anything faster than that would be too big and heavy for me to want to carry around, as I am not using it for professional work.After my 3rd race using the R5, I can tell you right now that the lens that I really NEED the most, is a new 135L and it MUST be compatible with the teleconverters. The 135L has long been my top low light motorsports lens and I have always valued its size, weight, and functionality with the teleconverters. Sadly, there's really no way around it - the 135L is not a very good performer on the R5 and R6. Not being able to use this lens at the top frame rates these cameras deliver, as well as no supporting the best performance from the viewfinder is really unfortunate. I have also discovered that face and eye detection don't appear to work as well either on this lens.
For me, this is a practical want and more along the lines of an actual need. It's the only EF lens I own that really suffers on this camera and when I travel for work, I favor taking this lens and the 100-400 over using that room for my 70-200. I guess if this doesn't end up coming to fruition, I will just pick up an RF 70-200 and sell off my EF 70-200.
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