Etsy unfortunately has no option to integrate bitcoin payments, better chances with shopify, but you need to also run your own BTCpay server. Probably worth to experiment with WP and Coinos.. open source, hassle free... you just pay for a web server.

You could try nostr instead! To publish products, I particularly like Coracle and Shopstr that would broadcast the items in multiple relays.

For the shipping/privacy, PO should work. Another option is to get a warehouse that also manage shipping on request. Otherwise, to start with, maybe just better handle orders and shipping manually until there's enough volume to scale.