Here is the solution, just playback those SavedTracks wav files with elastique changing the playback rate to match the DAW tempo map.
The plugin could also do what the DAW is doing, playing the source wma and changing the pitch and rate with elastique.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
elastique-plugin.png (7.85 KB, 157 downloads)
elastique-reaper.png (50.67 KB, 158 downloads)
wma-source.png (8.16 KB, 77 downloads)