Nothing legal - no.... But the Roadlock that's being sold on here is a good device... and takes up no room. Also some U locks fit - on some bikes... not sure the room on a SS.
No way, every car carries one or two of these so that we can all join in the blockades when we have nothing better to do.
I wouldn’t put anything under the Seat as it is a right twat to get to click back on. I would end up riding home with it loose.