find a wrecked 900rr(should be dirt cheap and you won't need a title), cut the mount off and cut it off yours then have it tig welded on.
as for the hole, buy a hole saw a little bigger then the hole cut a plug from the wreck and from yours(that way the alloy will be the same and make welding alot easier)have the guy weld both if you don't have a 4" grinder get one from harborfreight.com ($30 and not bad for the money) and a flapper wheel from homedepot grind it flat. done
p.s. find a local place that builds "tuna towers" for boats, those guys weld alum. all day and are excellent at it. see if he wants a little side job
'04 Honda 919, Candy apple red met., 17/44t sprockets,f-16 windscreen,delkevic ss exhaust,Tharbars,givi engine bars, billet alum. led turns w/ running lights,red adj.levers from china, bar end mirrors,grip heaters,adj. foot peg brackets,adj. bar risers,dunlop Q2(that are better than your pp 2ct,lol)bike wired for gps and phone charger