To make focusing easier for everyone you could get an electric focus of some sort. I moved my Orion Accufocus from my Newt to the C11, I have a Crayford attached to the end of the tube. I use the normal focus control as a rough focus and then touch it up with the Crayford. I find that adults and little kids can easily operate the focus buttons and they won't move the scope off the target. It will be the best hundred odd dollars you will spend.
As for a focal reducer, I got a Celestron 5.6 and found I don't have enough in travel when I have the Crayford and diagonal in place...but I mainly bought it for when I have a go at taking some shots.
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