Pretty specialized application. Different epoxy formulas have different setup times so you really need to know what you are doing or you could end up with a mess quickly. Anyway I suspect that trying to pump epoxy ingredients would be pretty difficult because of the viscosity of the material. A better method might be to use pressure to force material through the mixing orifice maybe? This sounds like a very difficult project with lots of experimentation required to get it correct, unless you are working from a proven design that gives enough details to duplicate.
Good luck
Lefty