Gramshep, when thinking about the best way to charge your phone on your steed, consider:
(A) How often and for how long you use your bike. All day, every day? Once a week? A bit each weekend and for two weeks each summer?
(B) How often you really need to answer your phone or make a call when riding your bike.
I guess that you'll use your phone no more often than you use it when off your bike? I guess that you are off your bike more often than you are on it? I guess that you don't walk around all day with your phone charging?
I guess that in 'all your years' of not having a phone on your motorcycles, you haven't really missed not having one, or you'd have had found a way of charging one.... It's only electricity and all bikes have that, even your Speed Tripple.
If I am correct in all my guesses, it's more than likely that you do not need to charge your phone whilst riding at all, or at least not very often. It's more than likely that you do not really need to do nothing more than putting your phone into your pocket, tankbag or copious panniers, leaving it in silent sleep mode (or better still off, as it will not drain the battery at all) only taking it out when you reach your destination of (depending on the usual usage of your steed) Vienna, Helsinki, Timbuktoo or your local branch of Tesco.
Blokes charging phones, blokes charging iPads. Ride your bike to free yourself of all concerns of the outside world, communication and information overload... Feel alive!
Away for a couple of weeks, as opposed to a couple of hours? Take a simple travel mains charger and charge the device up whilst you sleep; one simple plug and maybe two simple leads will charge a phone and an iPad, I carry mine in my very small spongebag. Hotel electricity you've paid for part of the bill, so use it! Stop in a cafe in Barnsley or St Perdue du Lost (or even the world's smartest restaurant) and ask the proprietor if you can use a tiny bit of his juice to charge your phone; they never say no. Trust me.
PS If you really feel you must charge your phone and gabble away whilst you hoon your awesome steed from A to C via B down every twisty road or mud plug down a goat track, at least do it properly. Powerlet make some really nice connectors, charging points etc. They have UK agents, too. Buy and use with confidence.