I think with all the rules restrictions in some of the junior high leagues, as well as possibly lack of experienced practice partners for a talented wrestler there may be several options to consider (regardless if it's permissible by the league or not).
1) Allow the athlete to practice with a club which
has good practice partners primarily for live
wrestling competition and drilling 1 or 2x a
week as opposed to practicing with the team.
2) Have the athlete practice with a club 1 or 2x
a week at night after his regular practice in order for
him not to miss his teams practice. The
problem with this is that it could put a strain
on a teen spending too many hours a week on
wrestling and limiting homework time as well as
free time.
3) Maybe a more feasible alternative would be to
have him work individually with an assistant
coach, highschool wrestler, or an outside
practice partner a few times a week during
his practices if allowed by the coach.

The bottom line is that it can be frustrating for any motivated athlete competing at a high level to be limited and not advance to his potential because of an inexperienced team.
Like it was mentioned in an earlier post, that being part of a team can be fun and a good experience for a junior high kid, but does one sacrifice advancing at the expense of being on a team. Or, does one try to work around being on a team and try to improve on his own by making outside arrangements.

It's a tough situation.