Most Webbrowser Support ftp. So if you setup an ftp server you can access it by typing ftp://[server] as the URL, if you want to do it remote I am legally required to recommend you using ftps

You don’t need any ID to sign it, so you can sign it on their behalf if they give you verbal permission.

What you should also consider, do you need a VPN. If you just want to avoid region blocking, (any) will do. Just need to check if their IP range is blocked by the provider. For normal https traffic you don’t need one. Enable dns over https in your browser and your traffic is as secure and anonymous as with most commercial VPNs.
VPNs have their use cases but we now have a decade of scareware ads from VPNs that implied our traffic is as insecure as it was in 1980. but it isn’t, you’re paying for a lava insurance. And let me say this, you can still be tracked if you use a VPN. It’s just a bit harder, like marginally

No they made people up that got mad. It’s just sympathy bait. It’s most likely an ad to fake interest in a hopeless project

\n is fun until you’re an a system that needs an additional \r