Martin you sensible fellow you...
I took your very practical advise and went to the Home Depot and looked about for what would do the trick, I used a pipe hanger bracket (it's "real name" i'm not sure) and some tin-snips to cut it to size and attached the exhaust hanger to the rear of the OEM master cylinder bolt (picked up a nut also to secure it down), and it looks like it'll work superbly. You suggest of the bolt that fastens the rearsets to the back of the frame would have been great but unfortunately there were no supplied bolts long enough to allow that so the OEM master cyclinder bolt came to the rescue..it's quite secure and solid there I think.
Pics attached, sorry for the dirty bike but even tho I've spent crazy amounts of $$ on useless farkles I still cant get the courage to ever wash the darn thing...
Hopefully it's clear enough to give a sense about what I did..
Pipe hanger cost $1.40 or so, nut and bots about $0.98.......tin-snips..$20 (ouch).
I guess while I was putting everything together my focus was too much on employing the supplied bolts, brackets and instruction on the installation guide in the box...sometimes you gotta remember to improvise.