You can set up a VPS and tunnel that to your minecraft server using wireguard some iptables magic if you’re into Linux.
After updating my uBlock lists to the latest version the popup no longer appears. Something to try out.
It has had quite a bit of downtime/undercapacity issues but for me it’s has been working fine the last year at least.
I think some work was being done on rewriting the backend to make it more efficient but I don’t know the exact state of that currently.
Export your OTP database to an (optionally) encrypted file on a USB stick and put that in a lockbox/somewhere safe. If encrypting the stick/file: make sure you use a memorized/written down password.