> e.g. magnetic station-keeping

I've not kept up for decades now .. what's the state of solar powered magnetorquers these days? I'd quietly assumed it would be more commonplace.

I dimly recall a couple of small satellites magnetically locking fifteen or so years past?

> what's the state of solar powered magnetorquers these days?

Academic. We don't currently have a pressing need for reactionless thrust in the magnetosphere. Each of semiconductors, launch vehicles and telecommunications standards are moving faster than satellites last.