Hi Daniel,
i don''t think it's a good idea to mix these technologies in that way. Please have a look at this best practice.
It's better to implement a service facade with SAP NetWeaver Gateway (or in very simple use-cases with SICF), which acts as an interface for your SAPUI5-application for accessing server-side business logic.
A useful combination is SAPUI5 and FPM/WD4A. When you use these technologies like in HR Renewal(ESS/MSS), navigation between apps is implemented via launchpads.
Regards Michael