Good point about the F1 factor, I had not even thought of that.
As for the seed library idea, we already talked about that and I am going to register the Little Free (book) Library's Even Littler Seed Library, when the time comes.
and thank you for all the research! I'd feel embarrassed that I didn't do those searches myself except that I know you are much faster at it than I and I suspect you really enjoy it also, which I don't really, beyond an initial bump of the google monster. So, really, thanks!