Of course not. The one thing I do see positive is that you would get a pretty good upper body and core workout with all the additional pushing around across the flats. Kind of like being in a kayak I suppose.
The biggest positive I see is breaking edge-pushing movement patterns. A full day on a monoski will make most right coasters better skiers on two planks. If they have the patience and proprioception to learn how to stop turning uphill and falling over, that is.
Think of it as learning all the parts of skiing that skating doesn't teach.
The poling is trivial. Poling a monoski around between lifts is to nordic skiing like walking to Starbucks is to parcours. And jc already does nordic.