I'm just across the border in Minnesota. As you know, anything with extremely wooly leaves are suspect to grow here, but that doesn't stop us from trying. Even Cerastium alpinum lanatum survives here, although it looks a bit bedraggled by the end of the summer. I think it is the heat just as much or more that plays the major part in summer alpine death. Of course, soil type being even more intetral than that.

I can think of 8 members right of the bat in our NARGS Chapter that know tons more than me, even though I am the present Chair, but of the ones you listed these I know are grown:
several Androsace spp. (not familiar with yours)
All alliums except those not cold hardy
some Erigeron (not familiar with yours)
All Lewisia except those not cold hardy
All Mertensia except those not cold hardy
All Primula except those not cold hardy
Townsendia incana

If you interested, one of our members published a lengthy article in our most recent newsletter about the saxifrages she grows. I can't send attachments through the GW, but if you would like to email me, I'll email you a copy of the newsletter.

Rick

And if anyone else would like a copy of the Minnesota newsletter, please email me too.
Rick