I’ve had vacuum pumps fail on me ... on Lycomings... but on aircraft the vacuum pumps use graphite impeller vanes that are self lubricating and run off a jackshaft... absolutely no chance of engine damage when one fails..
It seems to me that when you put additional burdens on a system you are just asking for trouble.
They can do any number of stress tests and engineer something that “Should” be OK, but unless they put the money in the quality of those parts, it’s likely to fail.
Personally, I prefer simplicity over complexity.
I can “Hot wire” almost any car on the road today, but that is getting more and more challenging as our cars ignition systems are more integrated with so many other aspects of its operation.