Hey Tommy, thanks for reaching out.
1) The brake is extremely easy to install, slightly less easy to remove but still easy. There are two pins you'll need to push simultaneously to get the brakes off, which is much more difficult in the field than a warm shop, but can absolutely be done.
2) Without modification, no. If you bend them out a bit, you could totally get it to work. I tested the 90 brake on a DPS Cassiar 95, Movement Alp Tracks 94, and a BD Helio 95 and the brake didn't clear on any of them, but it was close enough that bending them just a smidge would solve those issues.