Yeah i know the vid your talking about - can't remember what its called was on an LEI wasn't it ?
the technique you described is kinda how they all "fly" on the snow/land apart from holding the bar the wrong way round. . . most fly backwards
it's a lot more technical than you think in the snow takes some practice to ride down on a board and spin yourself round take off backwards
you've definitely got the right idea of practicing on a hill or sand dune first before your on holiday
heres an old vid of some landboarders doing it nothing special but you can see the technique