who are you trying to get in trouble and why?
KSHSAA does not allow kids not on the HS roster to workout in a HS practice during the HS season. My understanding is that during a club practice KSHSAA has no say (thankfully) except that HS coaches can not coach HS kids until the summer. (which is a real stupid rule that I can and have gone off on rants before but...)

This is what we did...once HS season was over my 7th grade son worked out with whatever club kids were around his age and ability (or hopefully even way better than him). During HS season he was not allowed to practice with us...obviously.
It would have been stupid for me to not have my 150 middle school kid (who is decent) roll around with our 145 and 152 pound HS state placers. right?

That is exactly what open rooms are all about.