Possible to accept students immediately even with manual payments?

I'm only using manual payments in coursepress/marketpress. However, I would like the student to get access to the course right after the order process. Is there a way to do this with 1. settings or 2. "hacking"?

By default the process is that the student goes through the buying process, I mark them as paid, they get access, I send the bill, they pay.

I need it to be: student goes through the buying process, they get access, I send the bill, they pay.