Drivetrain T-5 Tailshaft Seal: Replace Without H-pipe Removal?

Is there reasonable working room to replace the T-5 tailshaft seal while the H-Pipe (& exhaust gas recirc piping) is still in place?

I currently have the driveshaft unbolted from the pinion flange. I have the driveshaft's rear half supported by a piece of 4" wide plywood that bridges the two Flowmaster chambers. To provide clearance of the driveshaft yoke to the tranny, I figure I can slide the driveshaft rearward until it hits the top of the differential. However, the cross-pipe in the H-pipe may inhibit working clearance for removal & installation of the seal.

Any thoughts & suggestions on the working clearance needed (H-Pipe in or out) to do a removal & installation of the seal? Am I making it unneccessarily hard on myself by leaving the H-Pipe in during the job?

CAR: 1987 Ford 5.0, high miles, original T-5, original factory H-Pipe & EGR.
Thanks.

All great suggestions! Thanks.

• TIMKEN #7692S? : It's the tailshaft replacement seal that I was thinking of using b/c it is so readily available at a number of different retail outfits in my city. Is there any experience saying I should avoid this seal?
• DRIVESHAFT: Original stock iron unit here. I checked the end play and the lateral/radial play of the yoke at the T-5 tailshaft. One-Eighth inch was roughly the lateral/radial play. Seems acceptable?
  
• SEAL PULLER vs SCREWDRIVER: I noticed the suggestions to use a screwdriver on the flange of the seal to remove it. Is it best to avoid using a seal puller in this case so as to avoid inadvertently scarring the aluminum inner bore of the tail casting?
  
• SEAL DRIVER: I read the suggestion about pipe. I don't have much pipe around unfortunately. I was thinking of using the face of a 2" x 3" with the appropriate sized hole bored out to clear the splined tailshaft of the T-5. Seems workable?
• T-5 FLUID CAPACITY: It seems the level of the tailshaft in relation to the main case is such that it will let a good amount of the fluid drain out when the tailshaft seal is removed. Yes, I will buy more (Red Line D4 ATF). Do I remember correctly the capacity to be 2.75 quarts?

Thanks