[Suicide Junkie]

Destroyed on use is a very good idea, although I don't know if it would be sufficient on its own.

If it were combined with the "Chance to Miss", "Not all mines attack", or some of the other suggestions, it would be excellent.

It definitely should be moddable though, so you prefer, you could have non-destructive sweepers, 0% chance to miss, and 100% of the mines attacking every time.

As a stand-alone change, it would probably be quite easy to handle in terms of mods. There is already a destroyed on use ability, so it just has to be implemented as an optional ability for sweepers.