All I can see this rule generating is a lot of ill-will.
If you become a member you are entitled to the benefits:-
It doesn't include "the right to join a group operating an aeroplane administered by the LAA"1. Full Members
Full members shall have all the rights and privileges that the Association shall grant, which will include a free copy of the house magazine, services of the engineering department, the right to vote at general meetings.
The easiest way to deal with this is simply to scrap the rule, no-one's yet been able to demonstrate to me that it brings any worthwhile benefit.
I've suggested before that if it was envisioned that some of the additional income from the press-ganged membership provided an additional revenue stream to support Engineering then the right way to deal with the problem was to charge more for the Permit so that the charges made by Engineering are sufficient to meet their needs. I for one would have no problem with that.
If that is indeed the justification then the freeloaders are not the co-owners who are not members, they are the members who are sole-owners of Permit aircraft who are taking a subsidy from those members who do not fly Permit aircraft or who are co-owners!
The privileges of membership include the services of the Engineering Dept. This already means someone who is not a member can't submit an application. Personally I'd have no problem with a non-member's rate that is equal to the normal cost plus the cost of a year's membership. That way we'd satisfy those who want Permits but not membership and still get the money without the expense of sending out the magazine and without him having a vote!