good idea
Pilots assistant was all the rage some years ago. it provided a method of getting experience, and 50% logged. The CAA, have terminated this deal, I suspect.
The concept is very good, this is how I obtained the flying experience to get the type rating for Beech 200, and Citation 1.2. early in my long and exciting professional life.
I was fortunate to be asked to be second eyes on these types, below 12,500lbs, and took the written technicals myself, and then the owners, eventually paid for the type ride.
The regulations with JAR and FAR have changed. I am not 100% up on these, but check.
I do suspect that for what you want there is no problem.
Good luck, and get out there....