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@Gordon
That's an interesting thought - I think you might have to negate the output because the idle state is high rather than low, but potentially you could use the UART - you'd just use the start bit as part of one of the pulses. You'd have to be able to run the UART pretty quick though...
Has HWSPI been tested for Neopixels? It looks to me from the code like it's unlikely to be fast enough. IMO the library really needs pulling apart in order to be able to send individual bytes with jshSPISend without having to poke a whole bunch of registers first.
I think realistically adding a software library specifically for neopixels is probably the best way to go for now :(