I ordered those sorta-slipper things for him and they arrived today. Unfortunately he was up all night so it was not a very good morning (to put it mildly...) but he did wear them with surprisingly little fight considering how bad the morning was. It's a good sign. The other unexpected good thing about them is that when he takes them and off and throws them, they don't hurt as much when they hit you! I think these are the shoes for him! 
BuyerBeware wrote:
If you can afford to do so, it might be worth dragging to a podiatrist. I know they make inserts that change the pressure on the foot to help correct toe-walking; maybe they can come up with something to make shoes less hellish for him too.
There's one that deals with kids where we live, and I visited, and I decided it would be too stressful to go in. Maybe if he ever gets into a more compliant stage I will because I think it's a good idea, but as it is, I know he'd be lying on the floor screaming the whole time, and kicking the poor guy in the face if he went near his feet. I took him shoe shopping once when he was about 3 I think and oh my god, never again (and he was pretty small at 3!). He doesn't like people touching his feet...
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Mum to two awesome kids on the spectrum (16 and 13 years old).