Hate to break it to you rifle, but that's not going to change. Everyone else has to unlock utility or doctrine specific units, so why would airborne be special and not?
You made a choice in what you got, hence why all your points are eaten up. Some armor players don't buy a calliope or t17 because of what they want to run, and as an INF player I chose Rangers, healing centers, artillery and additional options with my basic riflemen. Does that mean I can't use off-maps or officers? Absolutely, but it was a choice I had to make.
Unselection will be worked on at a later date, after doctrines are all implemented I believe, so until then you'll just have to live with what you chose, sorry!