I am really happy with miniflux. It supports mobile and has good keyboard navigation support on Desktop. It's also runs really smooth on my rather low powered homeserver (rpi 2b).
For push notifications you can use a simple script with ntfy. For example miniflux-ntfy.
I had a similar problem like you. My provider only gives me a public IPv6 but no public IPv4. Im using a VPS with an IPv4 with jool to set up SIIT-DC https://nicmx.github.io/Jool/en/siit-dc.html
This converts all IPv4 traffic arriving at the VPS to IPv6 traffic which gets then directly routed to my homeserver.
Not sure if this setup would work for you. This is not a viable solution if you are completly behind a CGNAT without even a public IPv6.
Pro:
As far as I am aware Naomi Wu was one of the first people to file an FTC complaint. She has a video about the mask on YouTube.
Sadly she is being silenced by the Chinese government. Probably because she reported privacy problems with smartphone keyboards. Privacy that can be very important. For example if you are LGBT and your partner is of the Uyghur minority.