I used to ride the Burgman 400, and now ride a BMW R1200RT. Probably 30inch inseam here. Due to the smoothness of the garage floor, I was never able to straddle/rock the Burgman 400 off its centre stand as it would slide forward. I would always stand on the left side, side stand down, and my left foot in front of the centre stand to keep it from sliding. Left hand on the handle, right hand on the passenger handle, and then just rock it forward off the stand.
Now with the BMW R1200RT, straddling and rocking off the centre stand is impossible, as my feet do not even touch the ground!! So same procedure as above with the Burgman 400.
Personal stats for reference: Age 56, weight 179lbs, height 5'8", inseam 30". So I am not a "big" tall strong rider.