Gluing the wedge was an error, it's gonna be hard to get back out. You can try popping it loose with a chisel, but I'm betting it won't budge intact, and you will need to use either trimmed foundation with cross wires or simply replace the frames you used glue on the wedge. In the future, remember the wedge is just to hold the foundation until the bees draw it out, three small nails is quite enough to do the job. Makes it easy to remove later.
I plan to use brood frames until the bees don't like them, although some people rotated them every 5 years or so. Essentially you pull two brood frames per box every year after five years and replace them with fresh foundation. I'd not worry about the look of the wood, just scrape off any wax and propolis and install new foundation and pop them back in.
In the old days before the advent of persistent pesticides (other than lead arsenate!) brood comb was more or less permanent and could be used for decades. Now that we are flooded with persistent nasty stuff, the bees will eventually reject it due to the pesticide residue accumulation and it needs to be replaced.
Typically bees will use good quality old brood comb before new or foundation, and in will in fact move from a hive with only foundation into a box with drawn, old comb!
When making up new frames, I recommend using TiteBond II or III on everything but the wedge, and drive a nail through the end bar into the solid side of the top bar, this will greatly reduce the number of times you pull a top bar off trying to get a stuck frame out. I make my own stuff now, and make the end bars a full 3/8" rather than the rather scanty 5/16" factory ones (and sometimes they are really thinner than that). I don't consider frames disposable, although other people seem to.
Peter