If you're making sales and your items are getting to the buyers, I don't see an issue.

The main thing is that letters with merchandise to places like the USA are suspended. If your patches are just in an envelope and no customs form (ie: they look like a regular letter), then I guess those are getting through.

"New international customs laws mean we can no longer offer this service. Economy Air Letters with Merchandise sent to the United States will be returned to sender.

We originally suspended the service in April 2020 due to COVID-19 operating constraints. Since then, we’ve had to permanently end the service following new Electronic Advance Data requirements adopted by overseas customs authorities."