You know when i look at the bike.. i see a lot of surprising, almost provocative things..
Its Yeti, its rigid, but has discs..discs themself not very usual(brand).. there is a road deraileur..bright bar,grips, carbonshel seat, silver hubs with black spokes/rims combo
..everything seems to have an edge and attitude. .
and then.. there are those cranks that can be seen on perhaps 50% of new bikes in the shops around the world (im exaggerating, but you know what i mean.)
I would go with something more diferent.
Any Tune cranks (modern but stil retro looking)
Discontinued Crank Bros cranks (cleaner lines with that interesting stainless cover)
Rotor cranks (black with white graphics might go well with black/white stem..perhaps too brutal, but hey! its vintage yeti with discs welded on
why not Middleburns
or some older Stronglights from mid 2000