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Yeah the Rotor and SRAM BB30ish cranks are long enough - but I don't think you can get a bearing to take them whilst still fitting in the comparatively small bearing seat in a '90 frame.
Howard-
but I don't think you can get a bearing to take them whilst still fitting in the comparatively small bearing seat
Rotor 4130 bearings squeeze a 30mm axle into a 41mm shell by using double row bearings, listed as suitable for BB86 with road cranks and BB89 and BB92 with MTB cranks. I have no idea whether the road axle is long enough to work with these bearings in a 91mm shell, although it seems very unlikely as the road spec. calls for just 0.5mm spacers each side with an 86mm shell
gbj_tester
A Rotor 3D+ might fit it, they're super long.