AirPod fitting issue after radical mastoidectomy surgery

Because of surgeries on my right ear canal years ago, I can't get airpods (or any type of earbuds) to fit. No matter what tips I use or tweaks I try, they fall right out. My clumsy solution is to wear a headband, lopsided, which sort of works but I obviously don't get the full benefit.

I have consulted with my ENTs, a hearing aid specialist and have done endless Googling - nothing!

Ideally would be a way to have some sort of clamp to hold it in - although I can't for the life of me think of anything else. I would be so grateful to hear from someone who's had a similar procedure / issue - the OP was a radical mastoidectomy where ear canal externally and internally were altered.

Thank you Apple Community!

[Re-Titled by Moderator]