Maybe just go with good old Ritalin, or Biphentin/Concerta (extended release formulas, although I think we only have Biphentin in Canada, it's easier to abuse because its time-release beads in a gelcap, one can crush it all with a mortar and pestle while abusing Concerta is almost impossible, unless of course, you take the 54mg pills but I don't think your son would be scripted 54mg Concertas or if Canadian, the damn Biphentins go up to 80mg, I actually have a couple 80mg Biphentins in a little box with a bunch of stuff I don't intend on using, 2 80's and 5 60's (there is no 70's). Which reminded me, Vyvanse doses stop at 50mg here, no 70mg ones.
But yeah, good old regular twice a day (2x5mg...I was put on 2x10mg right off the bat and it didn't agree with weed at all so I ditched the script way back then). Ritalin might be a stimulant but its pretty mild, especially at that dose when eaten. But you can go with that weird stuff nobody likes I forgot the name of, for ADD, or Tenex and if you have an extended release form of Tenex, like we do here (Intinuvir XR), they're totally the opposite of stimulants, it can be used alone for ADD/ADHD, like Clonidine can,, Tenex is related to Clonidine, they tend to work best for ADD

I.