Could you elaborate more on the "a small VPS is free"? Except Oracle's free tier offer, I am not aware of others; I'd appreciate it if you could point me in the right direction.
For this I used GCP free tier -- not sure why everyone acts like Oracle are the only free tier around when GCP and AWS offer always-free tiers too. It's just runing socat to forward to the vape over tailscale. Is there something I'm missing?
GCP outbound data is limited to 1GB/mo and I believe by default it doesn't have any cap, it will just charge for additional traffic with the credit card you are required to enter in order to get a free tier account. So I would be careful publishing anything with it.
I'm not sure where to go for the free VPS, other than Oracle Cloud, as you mention, but a Cloudflare tunnel will get traffic into your LAN even behind CGNAT or other nonsense.
