Chazit > There was always a core group sitting in learning and not heading to battle
That’s a good argument, not ignoring Moshe’s words! Now the question is – can one self-select himself as a shevet Levi? Maybe let’s not discuss shevet Levi of those times, but look at more appropriate models: say, Zevulun-Issahar, when one learns and one works and they share schar. It is a contract, signed by both parties.
Why not pair someone who learns with someone who goes to the army, where they both appreciate the value of learning? I presume DL community will be able to do that within their own families. Presuming you are a chareidi – could you find a soldier who will be willing to join you in this partnership? Maybe you can increase your ties – you can help deliver supplies ot the army and share some of your learning when you meet.