Two Week Trip up North through Scotland | To ambitious?

I am planing a tour with a friend in August and came up with this rough plan using ChatGPT and Komoot.
We want to reach the northern Tip of Scotland (Dunnet Head) in 14 days including 3-4 rest days.
The AI suggested me to start in Newcastle upon Tyne, but I am not sure if this is to ambitious, especially with camping equipment.
According to Komoot it is roughly 750 km.
We are both fine young cyclists, but have never done more than a one night tour.

Do you think we are too ambitious?
Or do you have other comments on the route I crafted? I read we should be careful about the A9