Hello,
the answer to your question is: it depends...
If your libraries are not based on any OS services, it might be easy to integrate them on a system with RTOS - otherwise it can be difficult or impossible.
Anyhow - your question seems not related to GUI development or the tool 'Embedded Wizard' - so you will not find much information about your questions here - maybe you find more answers in forums for operating systems or microcontroller programming.
Best regards,
Manfred.