Referring to this question got me thinking (and laughing). I've used squat toilets a few times when traveling (and younger), although I try to avoid them.
I grew up in the US using "normal" western toilets. Many years have passed since I last used one in Turkey, and I've been diagnosed with stage 4 arthritis in both knees (bone on bone). Kneeling down is incredibly painful without some sort of foam or something to kneel on, and squatting is all but out of the question. Well, squatting down isn't so much the problem, as getting back out of the squat afterward (I'm wincing just thinking about it).
We're headed for SE Asia in a couple of months for about a month and while I know all the places we usually stay will have western toilets (my wife's relatives), I also know I'll probably run into at least a couple of squat toilets to deal with especially if we go to Viet Nam as planned.
How do other folks with similar limitations deal with this?