Tires and exhaust work (and body work) are fairly uncommon to DIY anyway, so he's not missing much there.
If you are so inclined (and owning an ODB2 scanner suggests you might be), why not offer to lend a hand changing his brakes with him? I've done that for several of my friends, some of whom turn wrenches, some of whom aren't at all interested, but are willing to rake leaves in my yard while I fix their car. Have him shop the job at a local mechanic, then have him buy the parts (with your help, so you get the right parts), let him see how easy it is to change brakes (probably the easiest job, maybe tied with an oil change) and how much he can save doing it.
Cam sensor change is also probably an easy DIY, but is also likely to be only 1 hour of charged labor, so not a ton of savings there unless you can buy the part substantially cheaper than the shop.