6.3 boosts use after exploring Act 6.3

Chovner

How can you remove all the Act 6.3 only usable boosts sitting in your inventory after you've 100% explored 6.3? As far as I know I can't use them in any other content, and don't want them perpetually sitting in my ITEMS menu

Hipoceros

Start any mission at 6.3 and use all, then quit.