Help with reduction

Good evening to all of you,

I'm currently editing (reducing) Arvo Pärt's "De profundis", but I'm having trouble with the percussion part. The piece features both pitched and unpitched percussion, and organ, so I'm using a double piano staff for the reduction. I was wondering if, by any means, it's possible to write the unpitched percussion part in the piano staff as well, like you would type for a drum set (I really don't want to add a new staff just for unpitched percussion).

Thank you in advance for your help.