@stroughtonsmith if you log into your unsupported App Store account, then toggle Automatic Downloads off and back on, then purchase the app on your iPhone, it should sync across to the Vision Pro, and if doesn’t, just drop the link into an HTML page with a smart banner.

I don’t live in an unsupported country anymore but I used this badly coded page for it https://mohammadag.com/appstorebanner.html

Could try it with an app you already purchased on your account, just in case they blocked it.