I think the keyboards on the Psions are the best I ever tried. If that's the first type MWeston brought up try to go for something that feels like that.
Initially hard to press, clicky phone buttons with barely any travel sound awful and would seriously affect my desire to use it, personally. I'm someone who wants to use this thing in every way open to me not just gaming, I know that's the emphasis of this and I'm here for that too, but if the keyboard cannot be of a high quality and comfort, then I'd tend to switch positions on the lighting matter and say sure, leave the light out and just make it as cheap as you can and add either something else to it or enhance another aspect instead. That's if it will never feel comfortable to use regardless.
That said though I can't help thinking it might be best to click them having so little travel. If they have to be so shallow perhaps it's for the best if they do.
Because I'm just thinking- if the keyboard is awful (and 1mm travel doesn't sound great for stuff focused on key use) there will be even less inclination to use it in the dark!!
I realise this will be smaller and I don't know if it's feasible to feel similar to, I think it was the 5 series Psion with so little travel in the keys but I'd rather them feel padded.