So, I tested out an international delivery and it went great. It got the the country in about a day but spent a few weeks in customs before being released. Everything arrived safely and it looks like my packaging works.
So now all that's left to do is work out how much post and packaging for international orders will be, if I only want to send it tracked, how to navigate customs charges and grow an international audience. So, you know, super small tasks.
For now, I can open it up to one country for testing and try sending one even further to see how that goes. If there's a genuine interest for international orders then let me know! I'll make it my half term project.