eric
The new version of Qt5 (v5.6.0) allow you to install all modules (qt5-declarative, qt5-xmlpatterns, qt5-x11extras....) from official arch repository.
Well, just update and keep qt5-base-nosystemd (be sure to employ the 5.6.0 version) and replace all modules qt5-XXX-nosystemd by qt5-XXX from official repository.