There is no way to unlink more than one clip at a time, however, you can select just the audio portions of multiple clips and then delete them, without ever unlinking them. Just hold down the Alt key while selecting just the audio. Then delete them.
There is no way to delete filters on multople clips. You need to change your workflow to get one clip the way you want it and then copy it’s attributes to other clips.
Steven
https://www.stevengotz.com