stick-wise, I think you'll struggle unless you look at 2nd hand...
Sanwa Gemini X is prob the only other choice, rx is quite small as it looks to come with the 451. I got the 451 in my 410 ok, so it can be done. All gear is tight in the 410 but a small rx does help! Moving from KO to Sanwa wasn't easy as the KO rx was much smaller footprint wise.
Steerwheel, I dunno! I know that both KO and Spektrum do some small rx.
HTH
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