Before you go through all the trouble of planning the hull
you need to make sure that the the little holes you describe are actually blisters
. Very often "Old" surface gelcoat below the water
line will take on the appearance of blisters. The inexperienced in their zeal can quite often create way more work than is required and potentially do much damage to the hull by planing away at the hull. I did a Cape Dory
bottom job two years ago, after bead blasting the bottom the gelcoat surface had millions of tiny holes covering the hull, just as you are describing, (These were not blisters). Serious blisters are usually larger than what you are describing and are or will weep water
that has been obsorbed. To test, get a Dremel tool with a small bit and go around the boat and without going very deep, maybe 2mm at best enlarge a couple of these holes, 2mm should be more than enough, to see if you can get them to start weeping water. Additionally you want to have the hull moisture metered by an "Experienced professional" to dertermine if the hull is in fact water saturated. If in fact your issue does not turn out to be a blister problem and the remaining gelcoatis still bonded well with the substrate then it is a simple matter of washing
the hull very well with water (No soap) and a green scotch brite pad, followed by a good acetone wipe down with lots of clean rags. Next step is the correct number of coats with a quality barrier coat followed by the bottom paint
of choice. Knowledge is definately power with what you are trying to do. A good bottom job is challanging enough without adding more headaches like blisters you may no actually have to the equation.