I'm confident that the R&D and operations costs for the production of the SBCs has already been covered by customers to date. So the risk of stepping on toes is more of a bruise than a break. Besides, there will always be the "why do it for free when I can spend $65 on it" crowd - of which I've been an on-again, off-again member through the years.
I say go for it. In the end, if your fix is legit and long-term, you'll be helping a LOT more people that you'll "hurt." But it is VERY thoughtful of you to even recognize the potential downside for someone else.
-V