Not sure how the fills and endings will work ?
If you put 60bpm drum wav in the 120 bpm track the ending will play over 4 bars and the fills will start earlier.
For 120bpm wav in a 60bpm track you will have 1 bar ending.
Try it and see how they work, just open your song in RealBand, set your song to the closest half or double available tempos in the RealDrums folders, so set your tempo to 95 then drag the 190 wav in (you can time stretch the wav you dragged in to the correct half/double tempo), set RealBand to snap then use ctrl+alt to drag the highlight sections to a position on a new track.
It would be good to have half/double time drums as you have the option to use half/double time instruments with normal time drums.