Very simple.
Add two sight slots for each rifle/shotgun/handgun that has tritium sights, just one for those that don't.
Make the tritium sights a permanent attachment (framework is there because of the paint options, maybe) because if you buy the tritium sights they only fit one weapon and you obviously want to use them if you bought them in the first place.
Individually purchased scopes for each weapon you want a scope on. Since it would be locked to the weapon it could use the paint system to apply colors to the scope/mounts/rings. Could possibly apply a different reticle to each rifle for further customization, we hope. Gives us the option to buy more gear and customize it, or leave things as they are and favor one weapon.
Please, add the option to mount scopes/red dot sights on the lever action rifles rather than just the side mounted scope. I'd much rather have the 1-4 scope on my Whitlock thanks.