I see your point but if the club rules state you must do a check ride if you have not flown for 21 days and you are a member of the club, well QED.
However, I'm not sure if you are saying that they won't count hours you do elsewhere? Unless of course, your share is in a complex type.
If that is so, then maybe a bit over the top if you can prove you are logging time elsewhere.
Finally, why do you have a share in an aircraft you don't use..or have I completely misunderstood?