Not sure the government needs to be involved at all. Purdue has an income-based repayment program. It's not a loan - technically it's an income sharing agreem

Not sure the government needs to be involved at all. Purdue has an income-based repayment program. It's not a loan - technically it's an income sharing agreement. A sophomore, junior, or senior receives an amount, say $10,000, and agrees to repay 4% of gross salary for 100 months after graduation.