Not a bad way to recce the route. Two advantages that I can see:
Maybe best done as a final recce a month or so before an attempt so as to get the best fitness benefits.
- You are not under pressure to get back to the car or do X miles so you can take the time to check out the best lines or areas you think you may have nav trouble.
- Even with lightweight camping kit you are going be carrying a few kilos of weight which will improve your hill fitness.