I sympathise as well.
Its not really cover at all in pro training. Presumption you have an ops deptment doing that stuff?
Its is a mild PITA in the UK where as in the US its very easy to do via the telephone wx brief.
And as for west highlands of scotland I wouldn't bother unless your none radio. Just make sure you contact scottish info and tell them what your intentions are. And have the contact number to tell them you are on the ground if you land anywhere without a tower or you can't get them before you land.
I have tried to motivate myself to get students to do vfr flight plans but the fundemental fact that they are as much use as tits on a bull in the UK means I have failed.
Yes I admit they will tell the emergency services what your planned route is.
But will they even know you have a FP?
Have you stayed on your route?
I reckon if you speak to your local info service tell them what you are really doing with a decent ETA at destination it is better than a FP which disappears into cyberspace and most of the time never gets looked at.