A misty is a forward inversion with a spin, a rodeo is its counterpart, backward inversion with a spin.
After you did the rodeo 7, you would be flat and back on the normal plane. To do a misty from this position, you would have to physically defy physics, stop the momentum of the backwards inversion, and reverse it.
Not possible.
There of course will be arguments now, but its because of a nomenclature disagreement that occurs in switch tricks. A switch backflip is a backflip, but you take off switch, land switch.
But a switch rodeo 7, if we were going off those same lines, is actually a switch misty 7. From the riders perspective, you throw a misty 7 and a switch rodeo 7 the exact same - only difference is that you start and land switch on the latter.
This discrepancy, in my opinion, really fucks with trick nomenclature, especially now that we're getting into almost SSX like shit... but its probably too late to change anything, and half the time nobody actually knows what they're talking about anyways on NS.