If you are really concerned about run-time with no oil pressure, the auto racing equipment folks sell engine oil accumulators in various sizes. Before you shut down the engine, you open a valve and the the oil flows into the accumulator which has a diaphragm or piston with air on the other side. The air is pressurized until it equals the oil pressure and then you close the valve, maintaining the oil under pressure. Before the next start, you open the valve, the pressurized oil goes into the oil galley and lubes everything before the engine turns. You start the engine, then once pressure has stabilized, close the valve for the next start.
I also built a similar device for starting engines after sitting a long time, after rebuilds, or oil changes (and I always prefill the filter)- a large pvc pipe with two end caps, one with a removable plug, the other with a hand valve. I put in a gallon of oil, keep the pipe vertical and attach a hose from the valve to either the canister drain or some oil pressure port. I pressurize the pipe at engine oil pressure with an air regulator, open the valve and close it when I see air in the tube, then start the engine. Instant oil pressure. I had a Ford diesel with a worn oil pump that had low oil pressure, and the engine started to seize before pressure built up, so I have been burned once. Don't try this if you can't keep stuff absolutely clean.