"A" Level training may or may not be what the kids need - - -

Is your team rec or travel? Ia ssumed it was travel. If it is rec I am surprised they let same kids come back to same team each season.

Having them trained by another trainer could be a good experience for both them and you. As suggested by others, why not all the players go as a team? Why not watch and you will learn something. Maybe you could let them go one practice there and then one practice a week with you to assimulate what is learned at the camp?

No easy answers, but it is nice the kids are being provided training of some kind during the summer.