I think the size might have to be pretty precise to get this right (I think decay duration is cubic in mass), so they’d probably need to be engineered to have a particular size. (E.g. add mass to a small black hole until it hits the right size.)
But, yeah, with this constraint, I think it can maybe work. (I don’t know the decay duration for the smallest naturally occurring black holes. But as long as this is sufficient low, the proposal works.)
I think the size might have to be pretty precise to get this right (I think decay duration is cubic in mass), so they’d probably need to be engineered to have a particular size. (E.g. add mass to a small black hole until it hits the right size.)
But, yeah, with this constraint, I think it can maybe work. (I don’t know the decay duration for the smallest naturally occurring black holes. But as long as this is sufficient low, the proposal works.)