I would have thought that with only 4 sheep the cost of hiring a ram, including possible pick up and collection charges, would eat a long way into any profit you may make from the offspring.
I personally would look into buying a ram lamb or shearling for meat prices, then if you don't want to keep him, sell in the New Year when meat prices have gone up, and make a bit on him as well.
Keep your eye on local sheep sales, or advertise for one.