If it's just for home games, which may be around 18 games a year, it might doable at Xcel.
When Target Center took on the Frozen Faceoff, it took the arena three days to make ice and the Thursday before to set up, for two days of hockey and Disney on Ice.
The arena still makes ice for the Disney show each year. The arena does have locker rooms directly behind each team's bench that wouldn't interfere with a lot of the basketball locker rooms.
Target Center can easily curtain off the upper level, the curtain is up all year, but the hockey press box would have to be moved. You'd probably have about 7,000 seats in that set up.
But will UST hockey draw enough fans in to make it worthwhile for either arena? Drawing fans for games against NMU and LSSU is a lot different than drawing fans for games against Mankato and Bemidji.