Well, if you are bound and determined not to use the cam driven system but still want to use the factory pump, then I suggest you relocate the pump to the front of the engine. YOu have room where the coolant resevoir is for the hoses and the pump body. You can just make a custom mount the comes of the upper motor mount. You can make a small custom pull then can bolt onto the front of the factory PS pump pulley, or you can use a slightly longer belt and make an idler system. Remember that the cam turns half the speed of the crank driven accessories so you can replace the pump shaft with a pulley twice the size in order to get the same pump speed.
I'd probably use a larger pump pulley that will run on the accessory belt with a custom bracket and hose extensions.
Either way, it can be done with the stock hardware and a little fabrication experience.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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