Teresa Greenway just posted a nice video on Banneton Substitutions.
Use THIS LINK for best viewing.
Check out her videos. They are very useful. This lady is a prominent baker that shares from experience.https://www.youtube.com/user/NorthwestSourdough
Theresa is great and her Sourdough courses on Udemy a steal (10+ USD). I have followed 2 of them and can’t recommend them highly enough. She’ll permanently answer your questions in the course forum and coach you whenever something goes amiss with one of the recipes of the course. Great training from a no-fuss highly experienced baker.