Any bellows will wear out eventually, so I wouldn't let that stop me from getting an original replacement, which I can confidently say will fold properly with the camera.

If you don't want to order from Linhof, I believe that Camera Bellows UK is back up and running, so you might see what they have to offer by contacting them through www.camerabellows.com, since they offer Linhof replacement bellows, and may be able to make them with alternate materials, presuming they will compress sufficiently to close with the camera.