I think minimum safe auto speed sounds a bit sporting! What speed are we talking about? constant attitude or min rate of descent? It's a bit academic in a single as the minute the donk quits you are no longer going to reach the destination, unlike a twin where Vtoss may well get you there.
I'd advocate the 10% of height=speed routine and suggest it if I see candidates having trouble with night deck landings. (It's not the only way, but it's predicatble and safe)
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Another day in paradise