Nomadic Non-Public Networks (NNPN) are expected to play an important role in future 6G systems by enabling mobile and rapidly deployable network infrastructures for scenarios such as emergency response or temporary events. In such environments, maintaining seamless connectivity is challenging, as both network attachment and spectrum access may need to be adapted simultaneously when moving across heterogeneous infrastructures. In this paper, we investigate handover mechanisms for NNPN and propose a zero-touch approach that jointly considers mobility management and dynamic spectrum coordination. The proposed architecture introduces an edge-based Spectrum Broker in combination with a Cognitive Spectrum Manager to support an atomic handover procedure, where network selection and spectrum allocation are performed in a single step. The concept is evaluated using a MATLAB-based simulation of a mobile healthcare scenario, where an ambulance with its NNPN transitions between Public Land Mobile Networks (PLMN) and Non-Public Networks (NPN).

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