Hey mate
The spots I know of in switzerland are Simplonpass, La Thuile, on the lake at St Moritz, Bernina Pass. I think the reason you are having trouble finding out info about the local guys is that there are not too many of them!
I have not heard of anyone kiting at Zermatt but it is such a great ski area, don't worry about kiting when you are there... I wouln't take kites at all.
Simplonpass has a lot of small hills when i was there in a bad season it doesn't look so great but I can imagine it would be pretty good with a lot of snow. Don't count on it being kiteable without a couple of metres at least. The road is excellent getting up into there, one of the best mountain pass roads. Don't know about the bus but an easy train to Brig.
There is a spot at the top of La Thuile (IT) / La Rosiere (FR) but i think it is a pretty small area.
The lake at St Moritz is flat and hard but you can ride downhill in the morning and then kite in the afternoon once the wind has come up. You can watch the early kiters struggling on the lake from the Corvatsch gondola and get a few more runs in until you see them a bit more powered up.
Norway is the go though if you are going to be there in March. If you get a DNT membership you can stay at mountain lodges fully catered for cheap and have a great time. Easter is prime time for ski touring in those mountains, normally heaps of snow at easter so no worries in march. Days would be quite short earlier in the year.
Hope this helps, let me know if you need more detailed info.