I’m liking the simplicity of dockcheck

https://github.com/mag37/dockcheck

Tax wealth, not work

One easy way to test accessing your site externally is use a free web proxy to try to load it.

For example (not a personal recommendation, just a random search result) https://wproxy.net/

Company I worked for a dozen years ago, who had many significant clients, already had most of their logos created by randos on Fiverr for pocket change.