threebob- not picking on youy- but just demonstrating why autism is different....
"for instance I could successfully include someone by getting them to provide the underpinning drum beat to a really much more complex melody played by some of the more gifted students"
Thiws just wouldn;t work with a child like this. Say you gave the drum to ds1 (who is very like this theoretical 17 year old) , he'd look at it, sniff it, maybebash it a few times, jump up and down, flap hands, open and close the door, then leg it out the room laughing.
To get him to join in you would need an LSA to practicaly sit on him, to hold his hand and hold the beater, to do the option for him, to say "ds1 do it", he'd do it maybe twice then drop it. The stand up. The LSA would have to say "ds1 sit down" pick up the beater, hold it in his hand and say "ds1 do it". Repeatedly.
WHich is why it won't work.
It owuld be great if you coould somehow turn this into what a success special education can be bloss. For example ds1 at mainstream didn't maange 2 mins in an assembly, he will now do an hour, (although sometimes has to go out and come baqck in, and frequently stands up so has to be sat back down again).
I'm still shocked that whoever wrote the quesiton thinks it could be in any way benefitting a child to be in that situation.