For the record, that tool worked great. Popped the lines right off with no destruction, it's just thin enough to sneak itself past the molded rib that makes things difficult. As suspected, the line coming off the pump did fail. Amazing that the truck ran at all, it had turned into a hard starting ***** for a good month and I was beginning to suspect the fuel pressure regulator.
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I somehow managed to shoehorn this ghetto rigged mess back into the tank and it's alive again.
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I drilled the hole so I could shove the screwdriver through to tighten the clamp on the pump. Left a big old loop so it wouldn't kink when it got compressed down into the tank. My only concern is that the mass of the hose may fatigue the upper fitting, the pump itself seems to have a good bit of compliance so that fitting probably won't ever fail.