You may not be able to do IPC for free with class methods, but you could use a disk based cache, a database or perhaps open a unix socket to a daemon lurking in within your class to do the IPC...

Wrapping stuff in classes can still be a good idea, and if you are keen on the idea there's no reason you can't have a go at it.

You've got the specs for your cake, just go and get the chocolate and see what you can whip up!

(obligatory pun about fork)