Shure sells wireless earbuds where the BT / battery sits outside the earbud itself and can be user-replaced. You can even attach them to good ol' 3.5 mm cables! And, since the connector on the earbud is standard, you can actually attach either other-brand earbuds or other-brand BT adapters. Other brands probably have something similar.
I have a pair or Shure IEMs I bought as wired over a decade ago. I've converted them to a lighting cable when I bought my iphone 7, then switched to BT when that cable failed.
Sure, the IEMs are bigger than airpods or similar models, but I find it's a good compromise. I wouldn't go back to wired headphones while at work, and certainly not while on the go.
