Pretty much what I suggested....Except I added body cavity wax to slow down any thing growing and I suggested buying & storing quarter panels since they appear to be going away so if he needs them in ten years he's got them & if he doesn't need them, they could be worth enough by then to pay for the repair..I have a respect for the smarter members of the forum, eldubb 440 and 1 Wild R/T, but....
I have some small bubbles in my car that have stayed about the same for almost 10 years now. They are below the quarter windows in my '70 Charger above the rocker panels slightly. I don't drive in the rain and the car is stored indoors. Humidity isn't high here. I don't see the problem with waiting until it gets worse or when you are in a spot where you need to fix body damage and repaint another area. I'm holding off for that...If I get in a bender, I'll take the plunge and fix any and every flaw and repaint the entire car.
That is just me though....