Saga Disc, size 56, 608 stack, 381 reach:
https://www.somafab.com/archives/pro...sc-frame-set-2 Tange Prestige front triangle, better tubing than New Albion.
LHT, size 56, 588 stack, 388 reach. Add 12mm of spacers, it will bring the stack up to 600 and shorten the reach by 4mm to 384.
You can always get a smaller size and add more spacers if you start from a frameset.