No welder alas. It’s on my list of things to learn as I retire.so with the head already mauled up- you may have to drill them out. Use a left hand drill bit, not the home depot drill bit sitting on your shelf. A TRUE LEFT HAND DRILL BIT AND SET THE DRILL TO SPIN TO THE LEFT.
not sure if you have access to a small welder but i would try to tack a bead next if the drilling out does work and try to get them out. take your time.
if you cant do neither, just button it back up and pretend nothing happened
Plan is to button it up for a few weeks as I’ve family coming out and I need to use it - then pull the radiator and get after it with better access and replace the cover since it’s been hacked at.