Yes I asked them on the Ali store. Availability seems to be limited though only in S, M and L.

I bought a different frame in the end - the SPCycles bike with the Grail like geo.

For me UDH is the way to go, especially after the Red release. Enjoy the build.

Thanks a lot for your comprehensive and insightful reply.

Its a good point on the spacers - given that the wide and non-wide BBs are the same and only differ in the included spacers, there should be a good bit of flexibility. I will check the spacer recommendations from SRAM. Aftermarket chain ring with 6mm offset might be an alternative here.

RE frame: Carbonda, especially the 707 might be the better option. The GR048 in M might just be a tad small, when looking at it in bike-stats. The 707 in M also has a 435mm chainstay and a generally longer wheelbase.