I think Substance Designer has a converter node to go between the workflows, doing it in Photoshop is silly tedious in comparison. And you could always modify or build your own node in Designer if it doesn't do exactly what you want.
Thanks for the kind words guys, you rock. As for his problem, I'll just copy paste the solution to the email he also sent us: Thanks for the OP's post and I hope he can accept my apologies for our website not being up to snuff. It's not easy creating materials which work with all of the different game engines, and for the…