only problem i see with your plan is turning in loose dirt.
the rollers need to be free to turn Independently
or they will slide and push up dirt.
rollers are great tools and grass will come up much better if rolled after sowing.
i payed $60 for this one and did a little work on it, bearings are worn, but its been pulled over many ac.
keep looking for one, there are a number of them setting in fence rows somewhere.