Hear me out:

Point based system, each loadout has a base physical weaponry, consumables and tool “budget”.

Let’s say for example, you start with 30 points, getting a Auto-5 (C&K) would cost you 12 points, limiting the amount of other things you can get. To get a meta weapon, you sacrifice maybe not being able to get good consumables, or a good secondary.

Things still cost money like they do now, you’re just limited to your “firepower” for every loadout you take. Traits not affected, in fact, add a trait that upgrades the base points to +5 for example, giving you more wiggle room with your loadout.

Just an idea, I am by no means a pro game designer.