Thanks guys.
So I decided to string it up using the trem last night, I knew there would be a compromise with the action as the wraparound bridge design along with the trem doesn't give a great break angle. There is a reason why 3/4 of the juniors and specials fitted with rhis trem don't have it anymore.
After stringing it up, all the strings sat in grooves worn in over the years and were solid, except for the high E. Everytime I bent a note anywhere above the 12th fret it would slide across the bridge out of place. I know I could sort it by filing a groove in it, but I don't fancy filing a vintage bridge, and I don't own any fret files.
As a compromise, I restrung the high E round the wraparound, with the rest of the strings going to the trem and it is rock solid now. I'll consider filing grooves in a repro bridge, or getting something intonatable in the future. What I didn't expect is that as the bridge moves a little with the trem - which does little more than a vibrato shimmer anyway - the high E moves a little as well, so I still get a subtle vibrato on all strings.
If anyone has any better ideas though, please let me know.
Here is a quick pic of my solution.
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