There should definitely be a place to be able to add another bubble or section to the belt kind of like the backpack pouches you can add to the side.
I believe you should be able to upgrade your belt with leather in a station to be able to add 2 more spaces in your belt at the same cost as a backpack pouch. It’s so nice to quickly grab something.
I think it would be a good idea to add a station to the character skin building to be able to have a work station for the belts. I know it makes the game more challenging to not be able to carry as much, but the amount of loot there is in the game it would be very likely to make it possible to do it.