Thank you for your advice, but, I think I'll carry on as I was.
I'm not setting out to "affect the mainstream", I'm working to produce a system that's as close as I can get to RISC OS, but with cheap and fast hardware, a more flexible kernel providing access to programming features, libraries, peripherals and, to an extent, programs that aren't available or even possible on RISC OS.
I'd also be happy if it provided a way forward for RO users and companies, but that is certainly not my goal; I'm just scratching an itch and making it available to anyone who wants it.
By the way, the concept originated with this conversation on the Iconbar, back in May 2003:
If it was just a matter of configuring a Linux system, that's what I would have done.