You don't have to use stereo. You can just use mono and pan them accordingly. Cubase can convert your stereo files to mono easily. That's what I do with my kick and snare from Superior drummer. Once in mono, I can use the correct mono plugins! ☺
In case you don't know, there is a video now from another member that briefly shows a Cubase work around that uses mono files for this trick.
Cheers!