The metal footrests on my 12GSA cut into the instep of my boots . I fitted the rubber footrest part from a G650X County. Haven't driven with them yet so I don't know if they will be very slippery.
G650X Country part nos
46717696748 footrest rubber X2
46717696948 retainer for footrest rubber cover X2
07119902745 nuts X4 (M5)