Panasonic FZ-G1 3 pinout maybe

| PIN |         | Description         |
|-----+---------+---------------------+
|  01 | Shield  |                     |
|  02 |         |                     |
|  03 |         |                     |
|  04 | GRND    |                     |
|  05 | 16V     | Supply (for dock ?) |
|  06 | 16V     |                     |
|  07 | 16V     |                     |
|  08 | 5V      | Supply for usb ?    |
|  09 | 5V      |                     |
|  10 | 5V      |                     |
|  11 | GRND    |                     |
|  12 | D-      | USB D-              |
|  13 | D+      | USB D+              |
|  14 | GRND    |                     |
|  15 | TX+     | ETHERNET TX+        |
|  16 | TX-     | ETHERNET TX-        |
|  17 | GRND    |                     |
|  18 | RX +    | ETHERNET RX+        |
|  19 | RX-     | ETHERNET RX-        |
|  20 | GRND    |                     |
|  21 |         |                     |
|  22 | SHORT ? |                     |
|  23 |         |                     |
|  24 |         |                     |

As you can see

That looks great, I would add two holes for mounting to the body of the mechanical design, or to use the two holes of the plastic piece in the tablet

I have been thinking about it. The lowest profile pogo-pins I found with little effort was 2mm tall with a 1mm moving tip. so there would still be a 2mm gap between the PCB and the expansion-connector. So in my mind it will need some kind of thicker 3d-printed exclosure, propably with holes for pogopins and a and neccessary holes and tabs for fixing the whole thing over the expansion-connector.

of course this can be modified, for example the profile could be lower/thinner if the pogo-pins were replaced with something different.
I have tried to find single springloaded compression contact used in some battery terminals. picture bellow. But they all seem to be pre-packed with standard pithches, not fitting over the expansion-connector.

and two details about my design, I tend to do my prototyping on a single-sided PCB, etched at home.

1. precise alignment, that’s why the chosen pogopins are through hole components with a tab
2. rest of the components are on the opposite side of the PCB so it can lie as flat as possible.

And now that I complained about the spring-loaded connectors, aliexpress offered them directly… :D
https://www.aliexpress.com/item/1005005574169122.html?

The B22A0 spring loaded connector seem to be a good choice, don't know how to solder those connectors tough
Would be awesome to find a 1,5mm pitch connector but I think those single connectors are the way to go