Just use mTLS via QUIC, it’s standardized, secure, future proof and has implementations in tons of languages and supports proper certificate checks and that whole ecosystem around it which they apparently tried to reinvent. It’s such a great protocol for these use cases, I don’t get why it’s not used more.
I don't think the consumer ecosystem is mature yet.
Adding a cert to my Android phone was a huge pain in the ass. Most homelab apps like Jellyfin don't support it. The homelab space is so buck broken it assumes i don't have a public IP address to just expose things without going through the convoluted VPN setup.