I think hatching eggs would be a phenominal and educational project on SO MANY levels for your troop... In fact one of the BIGGEST reasons I hatched eggs was for my daughters (ages 4 and 7) to experience it. Responsibility (turning eggs, monitoring 'bator), used CANDLING to view development (would clean up all their Christmas toys INSTANTLY if I threatened not to candle
!), also looked at a lot of embryo pix online, the pip, zip, hatch was miraculous (you would miss that part if no shells!!), hearing them peep & chirp thru the shells was amazing (and adorable!), too...
As far as could it EVER work... well, I guess never say never! BUT, would truly require an aseptic "lab" environment/mindset, and even with optimal conditions, it is pretty much a guarantee that struggling, malformation, dying, would be the MAJORITY of the experience!!! Traumatic for a lot of adults, let alone children.
Even with normal incubation process, we did have to deal with some death and lack of viability (2 eggs were "clear"/infertile, and 1 chick stopped developing around day 15... the other 9 hatched perfectly, tho!), but the positive far outweighed the negative (!!!!!!!!!). In fact, my 9 little "positives" are listening to "The Little Red Hen" as read by my 4 year old right now as I type.....
Don't let the fact that you've never done it before stop you, this site will talk you thru it, TONS of info, I think that "watching a chick hatch" should be on EVERYBODYS "life list"......