You can set the link to cut the engine if oil pressure goes below a predetermined level at x revs etc.
A 1.0mm restrictor would be better at keeping more oil in the sump.
Attached is a (very) rough drawing of my catch can baffles and beside it a better designed baffle system (beyond my capabilities but easy for Robbie).
Actually you could just have a series of horizontal plates (round or square depending on the shape of the catch can) with holes cut in them with a tube running from a hole in the bottom plate to the outlet.