Kendziorra - simpleHomeSwitch
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Unfortunately, but ...
Wi-Fi OTA upload on Mesh Nodes is not possible by the aforementioned reasons.
But... HardwareSerial Bluetooth OTA is a good alternative. With HardwareSerial Bluetooth is it also possible to use a (Arduino or Termite) serial monitor to get OTA (debug) information from the Mesh Nodes .
(HC-05 Serial Bluetooth: Windows and Android only)

Sonoff 4 pins header, ESP8266-nn 8 pins header.           Sonoff Bluetooth OTA debug information.
(as Fritzing included) You can use one Serial Bluetooth HC-05 module for all the Nodes .
Setup "Serial Bluetooth HC-05" is included as helper in the sHS library.