Having lived in Japan where there are a lot of these toilets, I can tell you from experience...
The safest route is to close the stall door and strip from the waste down. Otherwise, the slightest loss of balance can lead to a bad situation.
This is why I don’t go camping, LOL.
lol in Misawa in the early eighties it was an eyeopener to see the old locals just squat over the binjo ditch on the street.