years ago, in Ohio, where skiing was god at times, and horrible at times, I purchased PE sticks for repairing the slider suface on my downhill skis, many ski shops carry the materials, and I have welded PE using them many times to repair huge missing chunks from my skis.
Possibly you could get a ski shop pro repair guy to fix that....just offering the input. Grind out the cracked area, clean it well with brake kleener, and have them build the area back up, and then drill a hole....voila.
I actually remoulded the aluminum threaded filler neck into the fuel tank (PE) on my 74' KX450 with great success, using the sticks, a pinpoint needle tipped butane torch, and a lot of care....(I filled the tank with water to a point right below the repair).