I believe they did mention a weapon/gear guide in the last live letter, and that they were still deciding on the best way to implement it.

That said, I would love mannequins, like the OP I have a retainer full of gear (and weapons are stored on the other one).
I would even be happy if the mannequins could only wear AF gear, as that is the gear I am most attached to. I wore my myth gear for months, there is no way I am just throwing it out.