I used to produce a ton of graphics like this for a major retailer and like you mentioned, we were having to apply full coverage adhesive to printable magnet. Not ideal to add that additional step, especially for high quantities. We did a deep dive looking for an alternative and ultimately didn’t find anything (though this was ~2 years ago so that may have changed), but we did talk to a couple of manufacturers who agreed to take on that portion of the process themselves (adding adhesive onto their existing printable magnet product) given we were hitting sizeable MOQs.