I guess, if you find two styles that have the requisite grooves, this will work for you. The hard part comes if you find two, but one is half the tempo of the other.

If you can have a separate tempo for each Variation, I suppose you are good to go. If not, you may have to use a decent sequencer, and re-tempo the half-time variation. (that 'Tempo-Lock' trick I talk about in the 'Endings as mid-song pauses' thread explains how to do it) to make it the same timebase as the double time stuff would be cool...