Have a look at buying salt licks , Himalayan rock or similar . Have a look at Dennis Brinicombe Tubby buckets , if you look there are loads of cures for orf on the net but all involve catching and touching the mouth area , best just try salt and tubby and let it run its course Except if it becomes really bad eg swollen and bleeding then speak to your vet . You will be fine clipping your ewes ,wear thin gloves if really worried and you can inspect their teats for any scabs or sores which you can treat with spray from the vet . As to weaning its not ideal to have them next to each other plus the ewes will go for the salt & tubby and teach the lambs faster than the lambs on their own