Snooping around today, I found yet another option for HPFP upgrade.
https://www.nostrumshop.com/product/bmw-n55-hpfp-kit/
That makes 2 HPFP manufacturers for our cars that are local to me.
Unsure how this one stacks up against XDI, Spool, or Dorch, but the price point is pretty good (on par with Dorch Stage 2).