The Europa Clipper and JUICE missions will explore Jupiter's icy satellites using multiple measurement techniques. In order to build upon potential synergies and deliver more impactful science, we describe efforts to predict when occultation observations of these satellites' tenuous atmospheres with the twin ultraviolet spectrometers onboard both spacecraft could be combined with in situ observations made by these same spacecraft. The combination of such diverse observing techniques holds the potential to produce groundbreaking science and produce a deeper understanding of these atmospheres than would be possible by the application of either technique independently.