Nevermind, thank you for your detailed description.
I may also have found a variant for all iOS- and GarageBand enthusiasts:
As a supplement: the visual keyboard can be faded in on any instrument. You will notice if you play freedrums while it is open, the keys will be pressed by your strokes.
I haven’t tried it yet, but in case of doubt the only challenge is to come up with .wav-files. In this case Google can give you all you need.
In reaper it’s quite simple, you just have to change the position (perhaps interpreted as a note) of, for example, a ride cymbal, with a China Crash.
I posted the following screenshot a few times in the forum, just to give you an example:
Alex explained everything in his Tutorial on how to set up reaper here:
(Leave a like if @Alex_Incensus tutorial has helped you.)
The setup is the same in both Windows and OS X.