FWIW, I built a 300 blackout pistol with a Sig Romeo 5 and LAW Tactical folding buffer adapter for just the type of situation you're describing. It fulfilled it's purpose a few weeks back when I carried it in a backpack in an otherwise impermissible (but not illegal) environment.
I'm pretty sure the battery in the Romeo 5 will last years even if on constantly, so if it sees this type of use consistently, I'll just replace the battery annually.
I'd love an optic that costs twice what I paid for the pistol, but I don't have a $10M life insurance policy either.
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+1
I was thinking the same thing. 40,000 hours is a lot, and batteries are cheap.