1st gen 5 lug sway bar frame mounts

This issue has me stumped on how to proceed. So months ago I removed my sway bar to upgrade bushings, and while removing one of the bolts from the brackets that hold on the sway bar. The Nut that is welded on behind the mount that is welded to the frame broke off, causing the bolt to just spin. As some of you may may know there's no space behind the mounts so in order to get the bolt and broken off nut out a had to drill out the bolt hole big enough to just pull it out. We'll now I have no idea how to fix it. Do I just cut off the entire mount from the frame and weld new nuts to the back of it then weld the whole thing back on to the truck ? Will add some pictures

 

Can you just drill it out to accept a deep nut than weld a nut into the hole. Cut it flush after and should be fine