I support the electric Drain Pump. The schematic typically includes ability to pressurize the oil galleys before starting the engine. A gate valve is manually turned to select draining the used oil or pressurising the oil galleys. Whereas, most wear occurs during start up of an engine, that has not been run for a few days, the pump prevents start up wear.
Installation typically connects the oil pan drain fitting and an oil galley, at the filter head. The filter head galley is immediately before the crankshaft main bearing galley. (the first of critical bearings). The circuit includes the gate valve, after the pump, to enable pumping "out" used oil, instead of pressurizing the oil galley. New oil is then poured in as usual, through the valve covers or other fill port. Price for such a design is somewhere around $600.00.
Pressurising installation includes a helm mounted, "momentary on", toggle switch. The switch is held "on" until pressure is seen on the gauge, then the engine is started. The system should be pressurized in approximately 15-30 seconds.