It's got nothing to do with me really as I'm not a member, so I wouldn't buy a Lisa shirt, if I wanted a Leigh polo I'd buy an official one.
I understand the idea for Lisa to raise additional money, and IMO you should target non-members like me, as well as members, but I don't think it should be at the expense of a current sponsor, unless you were planning to go with O'Neill's? (Even then I wouldn't get one)
Perhaps you need to look at things they don't sell, but things that all fans may buy, Flags, Beach towels, Bog seats
I'm sure you could think of more.