Even still, you can get a small VPS and connect a VPN between it and your LAN, using it as a gateway with a static IP.
Gotta watch out for bandwidth limitations and data caps on small VPS like that though.
What a coincidence, I just finished writing the first revision of my own bot for this. It’s rough, but it works for me so far :)
https://github.com/kensand/rss-lemmy-bot
Reads like an Onion headline
Even still, you can get a small VPS and connect a VPN between it and your LAN, using it as a gateway with a static IP.
Gotta watch out for bandwidth limitations and data caps on small VPS like that though.