If memory serves right, xMod ( https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=464916887 ) allows creating weapon lists from the current inventory. First, obtain all weapons from desired mods, then save them as a custom weapon list, and access everything at once when necessary.

Getting specific weapons that are unavailable via mod menus might require adding them to a map in the POSTed editor, then picking up and saving as explained above.