Resealing a power steering pump is not that hard to do. Basically, there's a lip seal on the input shaft of the pump, the big o-ring where the pump body fits into the reservoir "can", and maybe a few other o-rings on the back of the pump. The front seal might be critical if there's a wear groove in the shaft, though. The big pump/reservoir housing o-ring is a square o-ring instead of round. A little care, finesse, and lube will make sure it doesn't get cocked when you slide the pump housing into the reservoir can. Of course, the pulley will have to be removed to replace the input shaft seal.
All in all, resealing what you have might be the most cost effective and expeditious way to go rather than trying to adapt another style of pump to the engine. Or just buy a reman pump without a reservoir and get that one installed in the existing reservoir housing. Then you can keep the core for later as they probably don't have much core charge on them anyway.
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