Teacher here, with a specialism in this area.
Your idea will result in some reading but it is not making the book the enjoyable bit: it’s making it a chore to slog through in order to be given something enjoyable. That association with reading will mean that they’ll force themselves through the book and not want to pick up another.
To encourage a reading habit with a reluctant reader, it’s vital to prioritise enjoyment, even if that means starting almost at scratch regardless of age. With teenagers, I never attempt to get them reading substantial quality fiction as a starting point if they aren’t enjoying reading to begin with. I mean, I can read classics with ease but I wouldn’t take Bleak House to read casually on a beach as I’d never concentrate on it: I usually take some sort of thriller that many might view as rubbish! So, the entry point has to be short and sweet: rather than focusing on suitable length and quality with a child / teenager who doesn’t read at all, you’re better to focus solely on getting them to read anything providing it’s pleasurable.
So:
- comic
- tabloid newspaper
- really easy book (call it a ‘quick read’ rather than an easy book
- books with pictures
- non-fiction e.g a football team annual / Ripley’s Believe it or Not / Guinness Book of Records
- listen to audio books, especially ones with multiple voices and sound effects. They still provide plot, characterisation, vocabulary etc etc even if children aren’t reading it on a page. Also great for dyslexic pupils.
Start with very short chunks - ten minutes - and ideally read and discuss together, or get the boys to read together. Make it funny if possible. This is where Ripley’s etc is helpful. Look up or explain unfamiliar words.
I’d reward them for reading daily for an entire week in ten minute chunks, rather than for finishing the book. This still rewards manageable chunks of reading and a regular reading habit. It’s still over an hour per week. The goal would be twenty minutes per day as a minimum.
Hope that helps a bit! You’re doing the right thing in pushing the reading, but I’d just shift the focus from quality / length to establishing that reading is enjoyable and give in ten minute bursts. Once that becomes a habit, then the books can get harder / longer / more varied in terms of genre etc.