I use my Pentax XW's, Nagler T4's or Tv Radians as they all have a larger eye lens and long eye relief and are generally easy for inexperienced people to use.
On the basis that I am using expensive eyepieces, I just make sure that no drinks, lollies or chocolate, go any where near the telescopes or the eyepieces.
I just prefer that approach, rather than using cheap difficult to use eyepieces that will only turn people away from Astronomy. Any high quality long eye relief eyepiece is a good choice. The Baader Morpheus that Scott suggested would also work very well.
Cheers
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