On a penny, the dismount involves sliding your foot down the frame for a peg you know is there but you can't see!
I got people to ride up to me, whereupon I would hold the bars with both hands and clamp the front wheel between my knees. That holds the bike steady so you can then get off, rather than fall off. 36" wheel IIRC, so not as big as all that. I was doing some work for the late lamented Cyclemagic, ran by Hilldodger, formerly of this parish,.