I have used plastic filing folders (accordion type) and also plastic cutting boards to make reusable liners. If you could find something similar it could work. In this blogpost I included video links that might give you a feel for the material (they are in the stiffer side):
soapsbyglenda.wordpress.com

An alternative to Freezer Paper Liners
If there is one thing I hate to do, like hate it with all my heart, it is to waste time. And money. Which some people think are equivalents, but they are not, not always. However, that is a subj…
