If you drill & tap the hole THRU the stock, it is drilled & tapped & no way to strip the threads...... IF..... you had the triggerplate up tight & etc so it stayed in place. I always clamp my plate up so it stays right where I put it.
DO NOT enlarge the hole yet. You want that hole snug on your tap so the tap stays true.
Have someone weld up the hole with a wire welder or buy a new trigger asm, Drill a Pilot hole in the triggerplate at the correct angle, in the place necessary.
Drill the new tap hole the correct size, drilling with a Drill Point in a drill press. Drill from triggerplate towards tang.
Then tap the triggerplate hole inserting the tap down thru the Tang into the plate with the plate up snug where it needs to be.
Then you drill a clearance hole for the screw shank, again down thru the tang but just TO the triggerplate.
You probably have half a dozen neighbors with a wire welders in their garage, you just don't know it. Ask around, go to town to a NAPA store & ask, go to any auto machine shop or auto body shop, or any welding shop. SOMEONE has a wire welder handy & will do it for very little.
Leave the JBWELD for patching holes in exhaust pipes to get you home..... It is not going to hold up to the screw stress, oil impregnation, etc. Or, you will just have to go back & fix it again. IMHO, Fix it right, fix it one time.
Keith Lisle
PS: Now if your hole you drilled thru the stock is not true, it will throw the tap off, so insure you have correct alignment first. If not, you will need to correct that initially to end up with true & easy screw allignment.