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Would that I were a rich man...
Keeping an eye out for a set of FSA SLKs for cheap now though, I'm thinking generally 130BCD is best as I can use the standard Brompton ring. It doesn't seem like there's much out there in the way of 54t 3/32 rings without ramps and pins. Carbon would be nice (because it looks cool) and external BB would be good because modern (and my Shimano HT2 has caused me no issues ever).
Vumachrono or GTFO