Till Realtek chip will be supported by a custom firmware, I have ordered few ESP-02s to try the brain transplant method.
I have desoldered the original module WBR2 and cleaned the PCB.
Then, solder jumper wires to 3V3, GND, RX, TX and GPIO0 onto ESP-02s module and flash Tasmota.
Configure as Tuya MCU (54) with GPIO1 as Tuya Tx and GPIO3 as Tuya Rx.
{"NAME":"Kinetic Switch","GPIO":[0,2272,0,2304,0,0,0,0,0,0,0,0,0,0],"FLAG":0,"BASE":54}
Additionally, the command
Backlog TuyaMCU 11,1; TuyaMCU 12,2
will activate both channels.
Desolder the wires from ESP-02s, clean and solder onto PCB.
That's it, assemble the device and it is fully functional. I control it with OpenHab via MQTT.
Final note:
I have 6 devices with WBR2, I will replace the module with ESP-02s for 4 of them and keep 2 devices for when a custom firmware will be available for Realtek W701-VA2-C chip. Even then, if there will be not an OTA solution, the module will have to be removed, flashed and soldered back because all relevant pads for UART flashing are on the back side.