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We use Vostok triangles, hopefully soon be stocking kinetics forks and triangles too for a steel option.
Also regularly in touch with Vincent, who built the bike you posted, so would happily / love to build using his options.
For Rohloff I use a cr18 due to the 32h requirement + good quality and strength, plus Uk dealer so we have tonnes.
Otherwise we use either the stock Brompton rims, jk Alu / carbon or whatever the customer fancies. They are all symmetrical though!
Not bad that; actually impressive weight distribution for a of M5's.
Etap disc would be pretty funky. What rear triangle you using? Also you using asymmetric rims?