'88 Supra: Problem removing the driveshaft?

Looking at the driveshaft, there appears to be a small problem. This car uses a 2-piece driveshaft; a front 'intermediate' shaft, a center carrier/ bearing, and then the rear shaft. The rear shaft is held in with 8 bolts,

4 bolts attaching it to the differential, and 4 bolts attaching it to a sleeve that mates to splines from the front shaft through the carrier. The front shaft has 4 bolts attaching it to the transmission output shaft, and then the splined shaft that passes through the center carrier. The instructions say to start at the diff, remove the 4 bolts, then remove the center carrier, and then slide the front shaft out of the transmission.

The center carrier has a snapped off bolt; it is held onto the car with one bolt. We can probably either remove this or drill through it and tap new threads into it, but I am nervous about removing the center carrier for fear of snapping the other bolt and rendering the car inoperable.

And I now see I was wrong. There aren't 4 bolts on the front shaft; in order to remove it, the center carrier needs to come out.

I'm going to start soaking all the bolts in lubricating oil today and for the next week. Anybody see any way to replace the front 'Spider' (U- joint) without removing the center carrier?