PETE: Why not just flog the Sanwa and buy a spare KO297 receiver, you can get em second hand for £10-15, or less if your lucky. Being analogue and with so many people switching to spektrum there are a few laying dorment in peoples pitboxes.
I would imagine the Hi-tec receivers would work with both (although I've never been a hitec fan) also the Novak XXL receiver should work with both.
Like you say, most important thing is use 2 KO xtals when using KO tranny and 2 sanwa xtals when using sanwa tranny.
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