Use of nrfxlib nRF 802.15.4 Radio Driver with SDK 15.0.3 on nrf52811

Hello, Im a little confused about the nRF Connect SDK ecosystem. 

Currently Im using SES with cloned nRF SDK 15.0.3 for nrf52811, however I would like to start using https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrfxlib/nrf_802154/doc/api.html API, which takes me to the whole software ecosystem chain. 

Can you suggest whether it is possible to use this part of the libraries as an extension to the plain SDK 15.0.3 or are nrfxlibs tied to the Zephyr RTOS ecosystem?

Could you siggest a way to import the 802.15.4 libs into an older SES solution or maybe suggest a SES project / solution file from the SDK 15.0.3 (or later possibly) that would take advantage of access to the nrfxlibs APIs?

Thanks, 

Marcel

PS: I have amanged to open a SES project from Toolchain Manager for nRF Connect SDK, but Im unsure what to do next - how to access the main() in these examples. 

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