A dwarf as ringbearer?

[Kuruharan]

I think that what that passage is refering to is the impossibility of turning dwarves into wraiths like the Nazgul. No outside force could so dominate them and reduce them to servitude in that fashion. The rings could produce a lust for gold and treasure but little else. However, that passage was also just talking about the dwarven rings, not the One Ring. The dwarven rings were geared toward the greatest dwarven weakness, greed of gain. Somehow Sauron hoped to reduce the dwarves to slavery through means of exploiting this weakness.

Plus the Dwarf-Ringbearer wouldn't have given in to the ring.

I'm afraid that I have to disagree. While it may not have been such a particular pitfall of dwarves, I don't think that any of them would have been immune to the lure of the Ring anymore than anybody else. The desire for domination was not just a trait limited to one particular race. It seems to be one of the "Melkor ingredients" that is part of the Children of Iluvatar and Aule.

And even if he did get it to the cracks of doom, would he be able to throw away this wonderful treasure?

Probably no more able to throw it away than anybody else.

But would the elves have let that happen? Considering the usual animosity between elves and dwarves, I doubt that the elves would permit a dwarf to have possession of the One Ring, partially out of fear of what they might do with it.

One would hope that if the fate of the world was hanging in the balance and a dwarf was the appointed Ringbearer the Elves would be able to get over themselves and let him take it. I realize that may have been a forlorn hope, so it's probably best that it did not turn out that way.