No you cannot use boxer primers in berdan brass. You can find berdan primers at some places online. Also decapping berdan brass is not the same as you would with boxer.
Maybe if you drill a little hole through it where the boxer flash hole is supposed to go poking out that little anvil thingy. I think I saw someone doing that on youtube once.
Question says it: I got a very sizable supply of Berdan brass, and the ability to deprime/reload them, now: Can I use my regular primers I use for Boxer brass, or do I need specific primers? If so, where can I get them?