At the risk of making a blatant plug for our app, you can do this easily with calibre + Calibre Companion. The best way is to make a custom column in calibre where you put the collection name(s), then add that column to CC's grouping drawer. You can then choose a collection, choose books using other criteria (if desired), then launch Moon+ on the chosen book.
Try the free demo version to see if CC works for you.
For more discussion about CC, see
the CC forum here on MobileRead.