Cranks to replace Marvin cranks - and that interfere with blinds

I saw your answer to a similar question here:
https://www.swisco.com/discussions/Marvin-Casemaster-window-crank-_-cover-PN-10898270-77-71144

But - the original poster never responded to indicate if any of the suggested part actually worked.

So while it looks like the 39-107 cover should work and so should either of the 39-114L or 39-205 handles, I'd also like to ask if you think I could just use a 39-107FK instead or if you'd have any concerns about that.

Thanks very much for any help.