Word on the street is no, it's not a good idea. During the sim ride they know you haven't flown anything similar if your applying for a traineeship. Might be a different story if you DE. I'm told they look for progression in learning. That is you start out a bit ordinary and by the end you may be able to fly the thing ok.
If you do time in a sim first your not likely to show progression in learning. Your graph will be a flat line instead of a nice climbing one. Folks on the inside may be able to provide some more info.
Rocket