TYB
Done right a barrel roll is a constant and steady 1g manoeuvre.
No excessive forces needed.
Even large planes 707s, Vulcan bombers, even Concorde have carried out barrel rolls without problems.
https://youtu.be/V9pvG_ZSnCc
>pulls nose up and then initiates roll to prevent excessive altitude loss
That is Bob Hoover and absolute legend demonstrating a barrel roll with a glass of iced tea.
That is a perfectly good barrel roll.
Pulls nose up and flies a spiral around the direction of flight.
An aileron roll the pilot keeps the nose on the horizon at all times.