[Myrion]

Thank you!

That does look like the likeliest solution and the idea about reference material seems pretty good, too.

Of course, that is a lot less useful for non-mages, no?
Since it is not always on, but needs to be powered, at double cost. So only MR 1-2 might be feasible, and that is already quite draining...

I'll ponder it some more, but thank you for the pointers.