I did a test tonight by pulling some fuses and see what happens.
When I pulled the ABS Control unit fuse (6) I got "Err" on the screen and the speedo didn't work, but the bike ran and the ABS remained switched off.
When I pulled the ABS Solenoid fuse (1) the ABS remained switched off, the ABS lights stayed on on the screen, the bike ran, speedo worked and showed no other warning or error on the screen. Importantly the regular warning and error lights were not lit, meaning if a real error occurred you would still know.

Removing fuse 1 seems like a legitimate safe solution for big days in steep terrain. Another option other than pulling the fuse might be to use a fuse tap or fuse socket connector in fuse 1 to create a switch, something like this. The only issue I see is how to route the wiring outside the little fuse box cover while still remaining sealed. Would be good to know if anyone has done this.
