honestly, I don't know who carries them. I suppose if you find a store that sells aftermarket wheels, ask them for an HKB adapter. I was expecting a MOMO, but the HKB works fine. I've also seen these adapters used on Hondas, so they must be readily available, but unfortunately I can't do much more than pass along the phone number for the place that ordered mine, maybe they can help.
905-946-7962, Formula Import, ask for Wilson, he has a fairly heavy Cantonese accent, so if you can speak that language, its a bonus. But he does understand english well, give him a call, maybe he can pass you a contact of some sort, not sure though, sorry. Oh, and make sure you get the adapter BEFORE buying the steering wheel, may save you some white hair. Bookmark that link as well, its really great.
I like your idea of relocating the cruise buttons next to the power mirror window space, that was where I was planning to move mine as well!

I even have a spare center console thingamajig to work on over the winter!
good luck, let me know how your project goes