I thought the OP's question was about pre-lubrication as distinct from accumulators and systems designed to prevent
oil starvation. Such simple prelubers exist and we used to use them on turbo motors before the advent of water cooled bearings. We ran them till we heard pressure bog the pump on start up and ran them on a timer at shut down. Today it is focused on preventing a dry start. The reservoir is your existing
oil pan. Simple and effective in my experience.
Ciao