We had outside cats that always got into something...I cleaned their wounds with Q-tip and soapy water...then I would pour peroxide on it a few times to help kill any germs. I would put on neosporin cream a couple times a day. If you have any benodine solution (the stuff they pour on you before surgery) it will help keep it clean too.
I know they licked it off but a little didn't hurt them.
If Ace stays in the house, can you put a small wrap on it? Just watch so it doesn't start oozing or looking swollen...he could be in trouble if it starts getting infected.
If you have a feed or co-op store, do they carry pet antibiotics since the vet isn't available...or maybe a farmer in the area has some to borrow?
When the vet returns, maybe you can get some from him to have it on hand in case it happens again.
Hope he gets better soon