Nice update there Geoff. It sounds as though you've managed to find most, if not all, of the features you were looking for when you bought the bike. ...
Re Flettner.
I used also this glue, but after first atempt, I made modifications to cores to have "hooks" to attach to central core. Misaligments on...
I have a magnetic tank bag I use on my FJ. Very handy for quick access to stuff that ends up on the bottom of whatever bag you usually stuff it into....