It doesn't take any tools to remove the tailgate.
The cables have larger loops with a spring clip that fit over the bolt heads, you might have to pry the clip lightly with a key. Then just open the tailgate less than 1/2 way open and lift. One side has a keyway, the other doesn't, so lift on each side. I can't remember for sure, but I think the left comes up.
My 83, 2 93's and 2000 have all been that way.
Sounds like you're gonna need a screw extractor to get that broken bolt out, but you can still "shut the tailgate and go to work".
2000 2.5 MO5D 4.10 one-wheel drive DD - gave to my older son
1990 STX 87 2.9 going in.....Junked it
2000 3.0 4WD M05D 4.10 S-cab Off-Road package with 235-75-15" tires, hotrod DD, lol