Setting aside the oil filter mod, what would need to be removed/re-plumbed to run a mechanical pump as a true “dummy” with the electric doing the work? There are two "check valves" (they allow one way flow only) inside a typical mechanical fuel pump, All you need to do is remove the valves and the operating arm that rides on the cam and causes the diaphragm to push up and down. That way the diaphragm wouldn't be moving and less likely to rupture (which causes gasoline to be dumped into the crankcase). If you are real paranoid you could remove the diaphragm and replace it with something gas proof.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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