I have my own design for a good panhard drop bracket which will use 2 bolts to connect to the frame so it cannot rotate (but will require drilling one extra hole in the frame mount). I'll combine that with welding it on and it will be the most solid PH drop bracket around. I just haven't got around to it yet because I've trimmed my gas tank skid and no longer rub on anything under there so it's not really on my list of things to do right now.
I have an M6 size bolt with a small head in the spot that the "problem" zerk goes in. When I need to lube the driveshaft, I take the bolt out, put the zerk in, lube it, take the zerk back out and put the M6 bolt back in. I recommend doing this because one of these days, you'll smash that zerk up in there, and probably ruin the threads trying to drill it out.