Since the idea was brought up (even just jokingly so), I'm genuinely curious! Would any of you like Pikki Rikki themed socks? If enough people do, I'm sure I could make that happen.
Got the game but can only try it after work. I'll give my comment later but about the sock, since the sock as a case meme for playdate is strong you could try some simple socks that fit well in the playdate and try a Rikki theme sock there would be cute.
Open a shop on something like Etsy, share it on reddit and here, and see how it goes. xD I guess shipping a sock might be cheap.