Just thought I'd post an update. Got the connectors from Tom Parker and changed the fuel lines over. Just done a 200 mile trip today (my first proper trip on the Mille) and no problems.
The main thing to pay attention to if you do this is the lengths of the pipe runs and hence the position of the connectors. I ended up remaking both runs to get this right - buy plenty of fuel line and Oetiker clamps. What you dont want, and what I ended up with the first ime round is either the connectors to be next to each other, or the lines to be too long. If the connectors are next to each other, the space is too tight and you may worry that the release buttons could get pushed due to this. If the lines end up too long, the pipes don't route properly and you can end up with the connectors in contact with the frame, which they will scratch and perhaps the connector buttons could get pushed. However, if you have all four connectors valved, all that happens is the connectors push apart a bit from the pressure. There is no spillage unless you actually pull them apart and then it's only a drop.
You also need to make sure that the connector buttons face in towards the cylinders - you don't want to have then facing out wards in case they push against the frame although if you get the lengths right, they shouldnn't anyway. Also pay attention to the positioning of the Oetiker clamps - particularaly on the banjo fitting underneath the tank. Mine only just cleared the guides which make sure you can only fit the banjo at the right angle. Also, you don't want the ears of the clamps either scratching the frame or rubbing againt the other pipe.
Here are the two lines connected to the tank. The whole length of the supply line is shown, with the new banjo fitting for the throttle body shown:
Here is my first attempt at the return line from the FPR. This turned out to be too long and the supply and return connectors were next to each other:
Here is the second attempt, which is just about right:
And here is the view through the gap between the frame and the tank with the tank lowered. NB: the return line gets 'pulled' a bit when you lower the tank, so you need to make sure the length is adequate so that is doesn't become taught:
Getting the tank off to check the valve clearances was a piece of cake with these fitted. It just makes routine maintainance less of a ball ache when you don't have to drain the tank and mess around with banjo connectors etc. NB: keep the old return line so if you do want to drain the tank, you can simply connect it to to the connector on the new return line and drain the fuel into a petrol can.
What I must do is measure the lengths of line I used for each run and post the details for guidance. Bear in mind it was about -4 deg C outside and snowing on and off when I did this!