It is difficult to push start a Kawasaki, they have that dumb positive neutral finder, making it hard to get it into second gear without the engine running. I would not start it if the battery is shorted or missing, it can damage the charging system.
I liked the sissy bar, but then I put the extended backrest on my Vulcan 750. I do a lot of traveling, and the backrest and luggage rack gives me a place for my T bag, as well as a way to tie things on the passenger part of the seat. IMO, both the 454 and the Vulcan 750 are to small for passengers unless they are really small, like kids, and they get uncomfortable real fast.
The 454 has a lot going for it. It is a very strong solid design, with a full double cradle frame, the engine is very simple and strong, with only one cam chain, and horizontally split crankcases (much stronger than vertically split crankcases) the stater cover is right out in the open, as is the water pump, there is no balancer to go bad, it has simple screw and locknut valves, and many parts are still available for it, because of the EX500 and Vulcan 500. The one bad thing about it, that was a good thing when it was new, is the belt drive. Belts are much better than a chain, and fortunately the belt is still available for that bike, unfortunately it now costs $400, about 4 times what it cost when the bike was new. It also has a really cool chrome front fender, like my Vulcan will have one of these days. Jerry.