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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-
It can only be as wide at the standard that Scott and Giant use in their bikes, as once you've pressed in the bottom bracket in either of those frames there is no need to use any spacers when fitting a hollow tech 2 chainset. You can use the bottom bracket that Rotor make as you said you fit a Rotor 3D+, 3DF, Sram Force BB30 (but not Red), or a 386evo into those frames so it would be the same with the Canyon.
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The Shimano BB91 bottom bracket isn't 91mm wide though. It's 86.5mm wide for road bikes, as the Canyon e-mail says, and is effectively the same as BB86. BB91 is the Shimano model designation rather than a different BB spec. The bottom bracket will be 86.5mm x 41mm, so a SRAM BB86 GXP BB will be fine, as @Juggle says.
Slack
Brommers
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.