If they wanted kollel students to join the “over the table” workforce, they would abolish conscription so they could take jobs in the mainstream economy without serving in the army. They would also enact laws against religious discrimination similar to the United States – Israel is one giant “hostile workplace environment” from an American legal perspective.
If they needed more hareidi soldiers, they would take seriously the enforcement of the laws requiring uniform observance of halacha in the army – which has been the law in Israel since the 1950s. As it is, the law if observed only if there are hareidim with lots of protectksia making vocal complaints.