i tend to fire up reverse port forwarding with ssh + special subdomain + ask nginx to proxy to the reverse-forwarded port on that special subdomain to resolve this, obviously you'd still need a static and public ip somewhere, but any ssh-accessible host will now do.

it's a bit of setup, but works quite well once set. does _not_ provide the features ngrok does of replay, etc, but at least it's 100% your own infrastructure.

edit: to clarify: no reason why it should be a special subdomain, i just use beta.mywebsite.com, just something that belongs to you and is globally dns resolvable, could be mytestdomain.com for your use. you can skip nginx if you don't mind binding to port 80 directly (i.e: no webserver already exists on that machine)