Simple. You don't lean the bike over far enough to create much leaning weight. You slide over in the seat a little to the side you are going to use for a foot down. Then you don't have to lean the bike that far over to load up your leg and foot. If you mess up and the bike starts to go the other way you johnny on the spot slide over and get the new leg ready.
Honestly I think longer legged riders have more trouble getting their head around one leg stopping or life without having to flatfoot. If you were short and wanted to ride motorcycles taller than low slung cruisers you would have already learned it's not that complicated.
I should add that I am a taller rider, at 6' 3", and I can stand with both feet flat on the ground and lift myself off of the seat by a few inches, even with my taller-than-stock RDL seat.
My problem is simple weight-bearing strength of either leg. If I tilt the bike far enough to either side to assure it won't go over the other way, that leg rapidly starts to hurt and weaken.
If I keep it close enough to vertical to avoid that pain and/or weakness, it feels like it's going to fall to the other side faster than I can get the other foot off the peg and to the ground.
Because of the limited range of motion my left hip had before, I couldn't step up or forward with my right leg, so my bad leg did more work and my right leg is now actually weaker.
As I said, this may all be moot now that I've had a new hip installed. I am duplicating the exercises they have me do with my operated leg with the other leg, so they both get stronger.