You just need to add a Gate vst to the track that you can adjust the threshold and invert it so it cuts the high level snare out and just lets the low level cymbal through.
There are plenty of free gate vst, if you can't find one with an invert/reverse you can duplicate the track in the DAW and reverse the polarity of the gate track.
See how you go and I will look for one later if you can't work it out.