Eggs are great, you're right. Also, how about some chicken, cooked with some liquid so it's nice and tender?
Or deviled eggs..
Cheese should work too...but not too much.
Tuna salad..ham salad..egg salad....
As far as your veggies, I'd skip the salad for now, and just overcook your brocolli, cauliflower etc a little bit, til it's soft and gentle on your sore mouth.
Good luck to you , and feel bettter soon!
Lesle