I looked at your items, even under the strictest interpretation of the new (incredibly vague) regulations your items which are made of paper can still be sent via lettermail.
If you use hard plastic protectors for the cards you might have to switch to cardboard but when placed in a bubble envelope I defy any postal worker to tell the difference.
Ben

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.