A couple of items come to mind that don't require special tools. The upper center portion of the outer firewall can be disassembled and moved out of the way. If this fails to offer sufficient clearance, remove the right motor mount retaining bolt (17 mm ?) and jack up the engine on the right side. The combination of these two procedures should allow adequate access to the bolt.
If not, consider removing the right motor mount and lowering the engine till the mount arm approaches the cross member. This will tilt and lower the engine to the right and may offer an alternate approach to the broken bolt.
You should be able to move the transmission oil dipstick tube out of the way after removing the tube's retaining bolt.
[Edited by jgl1 on 01-10-2001 at 12:14 PM]