I genuinely do not want to take the ring from him; if it is protecting him from being found - and re-dominated - by the far-reaching senses of whatever elderbrains linger in the material underdark still, then I want him to keep it, personally. He represents something important - something that should be given every chance to flourish and prove itself, and maybe in the future inspire others (not unlike the caste-breaking of a certain drow once did).
Ideally, rather than simply not acquiring it, I'd like a dialogue option to voice a refusal to take it, or at least voice such a concern, to him about the matter.