Throw the STM32CUBEWL V1.3.0, ST is already implementing LoRa Basic Modem that will let you create an end-node application operating on SubGHZ frequencies. FUOTA it is also implemented on the Same SDK. You may refer to the AN5554. Finally, for the LoraWAN Relay, we Plan to integrate it on the coming releases of the STM32CubeWL. But for now, you may need to do the implementation since is not yet supported on the current stack.
PS: I've created a new question since your original question is an old thread so I can give it more visibility.
Best Regards.
STTwo-32
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