It is a nice, flat circuit, so it seems a (good sounding) CK12 should work great.
I have a bunch of old B2 and B2 Pro mics with interchangable heads that I am planning on making into "mix and match" microphones, with different circuits and different capsules. I have several AMI T8 transformers (small, T-14 sized, but with Bv.08 ratio) to use for U47-style circuits (EF80/8000/802 tubes) in those bodies. We'll see how different capsules sound in the same U47 circuit then. I have one each Thiersch M7 red line, 3U Audio M7, MHBO CK12, BeezNeez M7, K7, and CK12 reserved for them.
For the preamps, I plan to use U47-style (Oliver Archut's alternate version), U49-style (again, Oliver's version), ELA M251 (based on
@Matador's version), KM84 (from Jonathan Burtner's FET847 design),
@homero.leal's pimped Alice, and maybe a C12-style, too.
I have most of the parts, I just need the time....