I don't know of a board like that. But why not just remove the IC's off the board you already have.

If you want to use the UEXT Connector, get the schematic for the board and locate the TX/RX pins used there, and change your #defines for TX/RX pins.

What pins are you using for UART2?

I am not sure what to say here because moving my I2C project from my ESP32-WROOM-32 Dev Kit worked just fine on the Pico Kit using the same pins. Do you have a ESP32-WROOM-32 Dev Kit, that you tried the I2C on first ?

How could anyone possibly answer that without you posting code ?

I would like to see how arduino address make menuconfig. It would be interesting to see how Arduino can make changes to these settings.

did you try make clean ?

The following scope capture shows the 3V3 rail and the voltage on EN line : (Green = GPIO34 / Yellow = 3V3)

This statement is confusing. Is the scope capture for the green line showing the EN line, or GPIO34 ?

What I have done which helped me was once OTA has been started, I kill all tasks that I have created. In doing so give full CPU resourced for it to handle the OTA update.

Also, why use 2 IO pins when you can use one to do the same thing. Tie REED_NC to +3.3v, and tie REED_NO to GND. From the Com. side of the reed (the side you have going to 10k then to +3.3v) take that to your input pin. Good suggestion, but considering that the reed switch will always be positioned...