I'm simply trying to facilitate their interest with negotiation, not force.
I acknowledge that, but force isn't the only consideration here, is it? IF bribery can be damaging to a developing child, then pressuring them to read would come with the benefit of learning to read, but at what cost?
I would talk to the child and try to determine why they appear to have no interest in reading. Keeping in mind as I stated above that most of the answer is going to be the responsibility of the parent. Keep in mind too that in the digital age, reading doesn't have to mean a book. I've seen some insanely cheap tablets lately. I would look into what is available out there in terms of children's/learning to read books in digital format. Who wants to use a rotary phone attached to the wall when they can be at the park and just whip something out from their pocket?