Here in I think you would be wrong…
Considering the number of Corporations that have decorations that either have nothing to do with RP, and also used just for jest.
The OP wants a Corp that would allow those wanting to be publicly known for supporting P4G to get a decoration and publicly displaying at their leisure.
Edit: Which is the point of Corp decorations, you can be given it, but no one can see it unless you select it for display…and you have the option to delete it as well from your Character.