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Just as an FYI, this is a common problem on the E36 BMW. Except instead of breaking the stud, the sheet metal rips out of the floor! The solution for that car involves welding the broken stud back in with a factory reinforcement.
If you are on a budget, you should give option 2 a shot:
-- Just get an 8.8 bolt in the same length (and pitch if possible) as the broken stud, a nut (if the pitch doesn't match), a big (and strong ) washer, a 3/8"+ drill bit and a hole saw.
-- Grind off the remains of the old bolt and drill out the hole. This may take some time; you should probably buy a kick-ass drill bit for this.
-- Use the hole saw to drill an access point through the floor of the trunk. IIRC, the gas tank is fully aft of the rear x-member. You should confirm this before you go crazy with the hole saw.
If it doesn't work, remember that you have 3 other studs holding the rear x-member in the car!
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