i think is not possible. Reason is, when u got multiple skins for same object, like 3 skins for katana, 4 skins for ellis, 6 skins for shotgun, only 1 may be applied in game for same object.
I read that in steam discussions.
To make it possible, u must put skins in server, and skin1 katana- replace katana, skin2 katana - replace knife, skin3 katana - replace machette. Only that way, but if u read weapons statistics, about speed weapons and damage, and u cant put katana instead of knife, or other meele, its imposible.
And other stuff is, players who dont have installed skins may have issues playing in server, or fail connect on it, like u dont have custom map which one is loaded in server.
This question is maybe for moders, and skin makers.
So Emil, you may ask here:
[You must be registered and logged in to see this link.]guys here put request skins, and stuff