What kind of support do you expect? I'm pretty sure that absolute majority of software does not care about any particular bits in UUID, so you can use it today.

What kind of support do you expect? I'm pretty sure that absolute majority of software does not care about any particular bits in UUID, so you can use it today. If some software cared about any particular bits, just imitate UUIDv4, I mean those bits could be randomly generated as well. If you need generation procedure, write it yourself, it's easy.