This isn't really a PoC Easter Egg, but take off Beach Head's vest, swap jungle Duke's head onto him, and tell me that wouldn't make a great Solid Snake figure with the addition of some gray paint.
As for the Predator homages, if I could get an Ah-nold...er, I mean, Dutch figure, and a figure of that pencil pushing son-of-bitch Dillon, I'd be really happy. Bench Press could probably be made into a pretty decent Jesse Ventura knock-off...