This is a raspberry pi image I put together, I did not write any of the software, I just put all the pieces together.

What this image does is if you are home or where the internet is available and setup on the pi then it works as normal but if you do not have internet access it goes into a Access Point mode that lets you connect to it via a laptop or tablet and vnc into the pi and use it as normal.
All the passwords are set to be: raspberry
The default IP address of the pi when in access point mode is 10.10.10.10.

To get it to work burn the image, boot the pi, wait a few minutes, check with a PC, Tablet, Phone for a new wireless connection called PotaPi, connect to it.
Run a VNC app like RealVNC and VNC into the pi at 10.10.10.10 then from there you can connect to your home router like normal.
The apps I have installed for HR so far is FLRig, Grid Tracker, GQRX, Ham Clock, HAMRS, JS8Call, NanoVNA Saver, and WSJT-X

Thanks to KM4ACK for the setup script that makes this work, I was writing my own but I could not get dnsmasq to give an IP to the tablet. https://github.com/km4ack