@Hashu
Yes you are right the after market support for Honda's Crazy. ther eis so much support and things tried and tested that there is notthing left to do from the creative side. if you think you are the only one thinking I bet you it has been done.
As for the 20V the only support available is mostly from Japanese tuners or TRD itself but that too not a lot of stuff available and expnesive to purchase compared to Honda.
You can be assured what ever model and engine is available USDM then it will have big market and with it support and knowhow.