I know this is a late post. I just joined the group. Try putting the meds in Gerber stage 2 Turkey or chicken baby food & see if your feral kitty will eat it. I used these for my sick kitties. Don't use beef or ham, they have onions in it which isn't good for cats. Also my pharmactist...
It saddens me the dentist can't fit you in before April. That is a long time to wait. If you are near Maryland, or Pennsylvania there is a place called Animal Dental Center in Towson, MD & York, PA. My kitty Willy has stomatis, the calicivirus & is FIV positive. He had a full mouth extraction...