I love Minnetonka Moscasin slippers and several of their styles have removable footbeds. It might take some clicking around their site to find the style you want, but definitely worth a look. https://www.minnetonkamoccasin.com/

My husband loves these. There are several style. Here’s one of the versions for women.

https://www.keenfootwear.com/products/womens-howser-ii-grey-felt-black

I've been wearing these and I'm satisfied with them. They are not slippers but they are the closest thing I could find without needing to go to a special store

https://www.teva.com/shoes/reember/1125472.html

They are lightweight, quiet, and stay on my feet

Need to wear my custom orthotics. They raise my footbed so the upper of the slipper needs to be very flexible or my feet start to hurt. They need to be booties or they won’t stay on my feet.

Ideas?

PS women’s