You just need a family member or friend that lives in a non emissions county. Register under their address. Your plates and cards will be mailed their but its works fine for the stickers. P.O box wont work.

Or find a garage that will give you a sticker regardless of the vehicles condition. Those are getting harder to find these days but its still possible. The seedier the garage looks the more likely they might do it for an extra $50.

Ive seen some counterfeit stickers sold online but none that looked good enough to try.