Agreed that it would be far simpler and safer to adapt the short W pump if possible.
That would be my prefered method. I have not put all of the alternative pumps together on the bench as of yet but it would appear that all of the necessary internal components are available to cut the nose on any pump and reassemble safely and dependably.
My only comment right now is if if the "shorty" pump is short enough and if not, if the cut nose of a stock height would offer more clearance then the currently offered short pumps?
As far as how you solve the cover issue, I have no objection to a different solution.
I simply do not know if that aftermarket billet "flat" pulley has a workable offset? It might be adjustable by relocating the mounting position of the flange on the output shaft and/or by fine tuning that with shims.
I am not necessarilly seeing the reason why the fan mounting flange needs that much clearance to the nose casting. I would think something like .100" clearance rather then .750" (or more) as shown is necessary?