Hi Mr. Bean,
Glad you are enjoying your bike! They are a lot of fun. I think a spare relay is a good call- you might not use it, but it takes less space than a MZ cable. A spare plug is also a good idea, but I've not heard of plug fouling as a problem on the V11. I would put the crappy tools that came with the bike on a shelf to collect dust, then replace them with a decent tool kit, just replicate what came with the bike with better quality, and one of those multi-tip screwdriver tools.
Oh, if the front wheel bolt came loose, take that as a hint to check all the other fasteners you can get a wrench on.
Cheers,
J