Paul,
I'm quite familiar with the Missouri 4-H shooting program...even though I'm not a volunteer leader for archery. I coordinate the state events for all of the various shooting sports. Can't give you specific advice about Kansas, as programs are not necessarily the same from state to state.
However, I'm guessing you will have kids with all kinds of equipment. A few clubs may provide equipment, but the norm is that the kid shoots what they bring. It may be an old Bear recurve or the latest compound from Matthews. Some will have the cheapest equipment mom/dad can buy, another may bring equipment that cost many hundreds of dollars. Flexibility is a great asset for a 4-H volunteer. :D
Just focus on teaching basic skills - no matter the equipment. On the national level, 4-H encourages beginning archers to learn basic skills with a recurve - though Genesis bows are becoming more and more popular. But as I said earlier - equipment can vary and in Missouri most of our kids shoot compounds...because daddy is a compound bow hunter.
Not sure how it is in Kansas, but in Missouri 4-H competition we have seperate classes. Two compound (fingers or release) and two classes for recurve/long bow (Olympic or Trad(barebow)
Good luck with your 4-H group. Just smile and be flexible....and remember - It's about the kids not about the equipment.