exlude sample from random triggering ;;

I would like te option to exlude ( certain samples ) from random triggering .
Let me explain , say I created a bunch of samples (whole keyrange) , all analog like waveforms with minor changes in the sample drawing,for imperfections etc…
I set keyzones to random triggering , so random waveforms are triggered .
Now , I have this neat little trick , I draw a tiny click sample and set it to non loop mode , this gives me a transient click at the beginning of each trigger .
Now this is the transient sample that I want to exlude from random triggering , because I want it to trigger everytime .