Can't remember when it's checked (ie. at boot or install) but those are manifested, so at best it won't work, at worst you'll end up with a luminous brick.
I'd strongly advise against playing with this without a shell (maybe even serial, depending how early this is setup) access.
Again, haven't bothered to look into it, but it'll probably be much easier/safer to do it the usual way (ie. fontconfig).
That, and this stuff is PW2 only, so you're on your own

.