I realize this sounds a bit irrational but I feel I need to make sure he is belted in properly or even more irrationally, feel like I could save him if I was sitting next to him

I'm also not keen on having him stand in line by himself. If he had a friend to ride with him, I would be okay with that.
Won't help with the belting issue (though it is harness/shoulder things like RNR coaster seems to have according to the Disney on a Dime show I watched last night), but did you see my Single Rider suggestion?
The waiting area for that is just a low, open fence away from where you could stand to watch him. He wouldn't be put in a line away from you.
The rider goes to the CM at the main line entrance, gets a pass. Goes back out towards the pier walkway, and in the accessible entrance gate. Stands in a VERY short line just *right there*. You could stand and see him be seated by the CMs.
Or you could just stand in the regular line with him, watch him be seated and locked in, then take the chicken exit.
Doesn't help with feeling that you could save him, either, but it does solve the waiting in line away from you issue.
Disneynut71, well, gosh! Hey, that last day of school isn't THAT important is it?
Are there any friends you could have tag along? And I'm assuming your son is not of babysitting age (meaning he's not old enough to babysit) so he can't wait with your 5 year old while you run off to play on the coaster?
