Ok so the verdict is in - I went and had a chat with the install guys at my local Jayco dealer, and what H/O have decided to do is run a sail track around the lid where the press studs are in the pics below - basically along the 'ridge". There will be several lengths of track, including a couple of smaller bits to get around the lid locks etc. They had pictures (not very clear ones though), that H/O had sent them showing how it has to be done.
So the current black privacy screen and also waterproof BEF are no good, as the press studs pre-done on those are in the wrong spot, and wont line up with the press studs on the lid pictured below. So new BEF's and privacy screen have apparently been ordered - I assume they have also taken into account that the actual size of the BEF and privacy screen will need to be slightly altered as well - guess I will find out soon enough...
Downside to all of this (not that there has been an upside as of yet), is that I wont be able to leave the black privacy screen attached to the lid when using the waterproof BEF, as they will use the same set of press studs...
I'm not convinced that the BEF will be as effective in this new position as it will be closer to the bed end canvas, however when I voiced my concerns to the install guy he laughed at me and started rambling about how the bed end canvas is "completely 100% waterproof", and just would not listen to what I was saying - even me pointing out that "why would Jayco even release a waterproof BEF if their canvas is completely waterproof?" seemed to fall on deaf ears...
When I told him that how on every trip in our previous van the bed ends got wet from rain (with photos as proof), he insisted that it was not possible, and that I must be the "only person that has ever experienced this problem ever" and so on.... I was growing quite weary of his condescending tone by this stage, so just walked away and went to find the actual dealer, who was much more pleasant to talk to.
@Crusty181 - hubby and I discussed the option of going with the older style bed end lid as you have done, but we are going to stick with this lid for now and see how it goes. I will post pics once the new cover is installed, and fingers crossed it will look good and do the job as it's supposed to.