I like the idea!
If I may add a suggestion, think of the weapon upgrade screen.
You could have a button on the right (or to make it simpler have tabs for when more DLC comes out) that swaps you to a "DLC Upgrade screen"
It would go something like this:
VANILLA > TDB > HOW > COMET
Each DLC screen would have 3 or so weapon damage upgrades that would be available to upgrade only after you've completed the DLC's main story
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I like it alot. I was thinking pretty much the same thing for how many upgrades per rank, 3 seems reasonable. If this went full steam ahed and bungie were to add it in the future then this would be really good. But as is, any type of UI stuff is just wishful thinking haha. Really good though, im glad we are on the same page.