Ugh AR reading

My 4th grader has an AR reading program and his homework is to get 1 AR point per week in his level (4.1-4.5). We’re struggling because he has adhd and that affects his attention span when picking books & also reading them. He needs LOTS of options and he needs to be able to start a book and switch if he loses interest or abandon all together. He has 1 library day per week with his class and has time in the morning but he’s not that interested in going. I’m using the renaissance find a book in combo with our local library but still having trouble.

Any recommendations for shorter books with AR quizzes in levels 4-4.5 or chapter books along the lines of captain underpants/ dogman?