Is it possible to allow players to edit their weapons and save them from the main menu?

Currently, players can only edit their weapons (such as weapon attachments and skins) during campaigns. Furthermore, players must purchase the weapon before editing it. At the start of the game, players only have $1000, making many weapons unaffordable. This results in players being unaware of their current weapon progress.

Therefore, could players be permitted to edit their weapons within the main menu and save these modifications to the game's presets? This would not only allow players to track their weapon progression but also save time spent editing weapons during the preparation phase.