The debate about which bike is most suitable will go on forever. After much consideration, as already stated I arrived at the Honda CB500x. because it's lighter, has a lower seat and is more nimble than most bikes used traditionally going 2up rtw. purchase price including on road was $8106au. I purchased the bike from Waikerie Honda here in Waikerie South Australia, I can't say enough about how obliging Ian the proprietor has been! (if you ever read this Ian THANK YOU).
Then came the required modifications, many of these in my view are very subjective. For example, how do you intend to ride, slow and steady across rough terrain or ride like a bat out of hell! Both styles require different approaches. As I am old and my wife is not far behind, our style is pretty sedentary, no mono's, or flying through the air!
One never knows however when you may give the bottom of the bike a bit of a nudge on a bolder in a creek crossing etc, therefore a substantial bash plate is a must, a hole in the sump would be a major set back on route. I was unable to source a bash plate that had good solid mountings and could be used in conjunction with a centre stand. Mounting a bash plate did have some challenges due to the centre stand. The centre stand leaves one with very few options for mounting (no place to bolt), so I set about making a clamp style rear mount, I fabricated the plate from structural grade aluminium, over all it appears it will do the job.
Next job was to buy and mount some panniers and a top box, buy a tank bag, second battery added in top box, Change tyres, make and mount side tool carrying tubes, mount spare tyres, replace the windscreen with a larger one, make a phone mount for GPS, add some power outlets on the handlebars, and finally a "Brakeaway" cruise control.
We had the bike serviced prior to leaving , changing chain, sprockets and oil and a good going over.