I would suggest setting up a reward system based on individual interests. If, say, an autistic enjoys computers and other technology, then set up a system in which they must earn point credits by achieving goals at increasing levels of difficulty. They will then be able to exchange these points at the end of the course for a particular item of their choice, such as a cellular phone, a musical instrument, a computer, etc. I believe this will be most practical for NTs and autistics alike, as it will prepare them for the real world in which material possessions are earned by means of hard work.
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Autistic (self-identified)
Open source, free software, and open knowledge geek
GoLang, Python, & SysAdmin aspirant
RPG enthusiast
Has OCD, social anxiety, CPTSD