I didn’t notice until Delta9K mentioned it in the Violectric thread, but apparently the Bifrost 2 can also take the Bifrost 2/64 firmware update, which enables a NOS mode on the original Bifrost 2:
https://www.schiit.com/firmware
I might play with running the BF2 in NOS mode (or even NOS+HQPlayer) whenever I get around to it, but I’d definitely be interested to hear from anyone else who updates!