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Hybrid user interfaces combine cross-reality devices (e. g., head-mounted display) with other heterogeneous device technologies (e. g., smartphone) to compensate for the disadvantages of one device with the advantages of the other, such as addressing the lack of haptic feedback in mid-air interaction with touchscreen input. Such hybrid user interfaces typically involve the synchronous use of multiple input and output technologies. In this work, we instead consider the asynchronous use of heterogeneous devices (e. g., using a desktop and virtual reality device in sequence). While the sequential use of different technologies does not necessarily offset the individual device-specific disadvantages, it allows users to choose the more appropriate device for a particular sub-task. In this context, transitional interfaces play an essential role in enabling the switch between devices, while allowing the user to maintain a mental connection between realities and seamlessly continue with their task where they left off.