Well I don't think there actually is one (yet?).
Spokes and Sustrans have been campaigning for years about the route(s) from Edinburgh to the Forth Bridge. There have been some improvements around Cramond and Dalmeny but little to create a fairly direct (and safe) route.
It seems likely that there will be a new Forth bridge fairly soon and traffic patterns will change dramatically.
Presumably there is even greater risk north of the Forth for cycle infrastructure improvements to be 'forgotten about' or badly designed/implemented because 'not many people cycle'.
The Forth divides council and police areas making it more difficult to guarantee any real co-ordination and co-operation.
One small problem with cycle routes between Edinburgh and Fife is that they are usually categorised as 'leisure' and it seems to be assumed that people want/don't mind scenic routes.
Though of course there would be more tourist and family trips if decent routes existed, were publicised and seen to be safe.
There's actually quite a lot of things in Dunfermline that make it a good 'destination'.
"Pittencrieff Park or “The Glen” as it is more commonly known as by the local people"
Perhaps Spokes should become "The Lothians and Fife Cycle Campaign"(?)!
From some of the posts on other threads it's clear that PMing is going on.
GOOD LUCK with your plans and strategies.