Thanks N3QE--any particular CW kits in mind??? I am actually part of the local Makerspace Hacker electronics club but have not yet worked the Ham club into it, having only just joined.
I think any CW-based project could be great.
Typical grade-school stuff in my area, involves turning old computer mice clickbuttons, into CW keys that key a code practice oscillator the kids build themselves.
If you hooked this up to a computer with a CW decoder they could send morse and see it decoded on screen. That adds some computer-screen interactivity which is a good route to interest with the kids.
For older kids that might be interested in information theory, a chart showing how the shortest morse letters are also the most common Engligh-language letters might be a good introduction to cross-compare with file compression etc.
Old-fashioned analog scope hooked to code practice oscillator is also a good visual draw.
If there are members of your club that don't do currently do CW, they might learn some CW in the process, buidling your club's skillset! Having older hams learning CW right along with the kids is just beauty. I learned CW at age 10 at a local club class, at the time almost all the other guys in the class were in their 50's or 60's.