Duke had his teeth extracted a couple months ago. He had 8 baby teeth removed and it cost £110.I would wait until he is about 14 months and if he has still retained his baby teeth,book the op.
Im not sure which insurance company you are with,but many policies do not cover the cost of teeth extraction. I think it will probably be too late to train your puppy's ears to stand.
I tried 1 of my girls Duchess at 7 months and it didn't work. Never mind they look so cute floppy