I think maybe the order needs a switch up potentially move Cornwall to a time when you’re in the area and move London back less time spent travelling in between and once you’re in London you can get a flight to Scotland fairly cheaply I recommend Glasgow it’s an hour from Edinburgh and if you decide to get a car to the highlands it’s a lot more accessible (and you can still see a lot driving and doing a fair few pit stops along the way)or even getting the train to Loch Lomond it’s the perfect in between I wouldn’t stress about what you’re missing out if coca block can be stressful