Can I run a helicoil? Couple videos online where they use it. Not sure if it will hold fluid though.
Be careful fixing this....I would recommend NOT doing it with a hand drill...it needs to be fixtured in a mill or at least drill press. The threads need to remain concentric and aligned with the seat at the bottom of the hole, or it will leak. Sometimes you'll get lucky by hand, more often than not you won't.
When I do repairs like this, and I do quite a few, I try to pick up off what's left of the hole, the actual port below the hole, or if the other hole is at the same angle..that....I'll thread a tap into that, grab the tap with my mill chuck, and then clamp the caliper down...that keeps the appropriate alignment. When drilling, creep up on the depth, keeping the quill stop short and advancing it about .020" at a time until I just touch off the bottom of the hole to re-establish the seat dead center with the hole I just drilled. Then in the same fixturing, I cut the threads and install the insert (I prefer time serts over heli-coils). Gotta use a pretty short insert for blind holes since the install tool needs to come out the other end a few threads to lock it in, but since the insert is steel rather than aluminum, and we're biting on larger threads in the aluminum, it holds torque and works just fine as a permanent repair that will never fail or come out. I've never had a leak doing it this way. Lots of leaks doing it the other way.