No point in commenting on tomorrow's weather. I don't want to jinx it.
I'm not entirely sure of the point that you are making WB. You are right that as a diversion for Kemble, there are plenty of good places to consider - Gloucester with its instrument approaches for example.
My point is... if by some misfortune tomorrow you take off and encounter poor weather, which forces you to exercise that pre-planned diversion, would you expect the Gloucester landing to be free? I wouldn't, and I'd like to think that the thought of a Gloucester (or wherever) landing fee wouldn't make the difference between my choice to divert, and my choice to push on. Some might disagree and try to push Gloucester for the AOPA deal. I reckon that's bad form.
In the more clear-cut case where you elect to take-off to a VFR destination that is already below VFR minima or 90% likely to go below, if you end up somewhere else on a divert, trying to get your landing fee waived is totally unjustifiable IMHO. As a mechanism it rewards poor or absent flight planning.
2D