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I hope you are aware that all your EF lenses will work flawlessly on the R10 body. You just need the adaptor. Canon has introduced <b style=”font-family: inherit; font-size: inherit; color: var(–bb-body-text-color); background-color: var(–bb-content-background-color);”>RF200-800mm f/6.3-9 lens recently. You can try that. I am using 800 mm F11 which works fantastically in good light condition.
Hope that helps. If budget is not a problem, you can go for RF 400 mm F2.8 with 1.4x or 2x extender. I have seen amazing results.