It looks like the below mylar pieces should pevent wear in the areas mentioned above where a Cliffy isn't possible to install.
Pops
http://www.pinballlife.com/index.php?p=product&id=303
Slingshot mylar
http://www.pinballlife.com/index.php?p=product&id=304
For in front of Winkie drop target
http://www.pinballlife.com/index.php?p=product&id=305
Also, check out these below.
http://pinballpal.com/stealth/
This is slightly off topic but for those that have performed playfield swaps do you recommend installing mylar around the pops?