i understand that it's not quite as easy as bumping up the core multiplier as it would be with a 2500k.
Not quite as easy? Try impossible.
You can't overclock that processor, that's the whole point of a k series chip. All you can do with that one is raise the BCLK, which SB chips are extremely intolerant to. At best you could get another 100 MHz out of it, and even that's pushing it.
If you want to overclock, you need a new processor. Sorry.