: I don't have the passage in front of me, but my memory agrees with yours -- Isildur said some rather remarkable things to one of his sons (the one said to most resemble Aragorn), basically (1) That he had not yet learned how to use the ring, and (2) That he now realized that the ring should have been destroyed. I think that it was clearly his plan at this moment to try to have the ring destroyed (I believe you're right as well that he specifically mentioned giving the ring over to another keeper).

: Now, whether he could actually have done that or not remains an open question. Even to say this after having possessed the ring for a couple of years is impressive, I think. But what would have happened as he approached Rivendell? Would he have maintained a Faramir-like cool (Faramir, who never held the ring at all)? Or would he have succumbed to the temptation that kept Gandalf, Elrond, and Galadriel all from taking it?

: Both answers are interesting (and purely speculative).

My gut feel is that, no matter what he said in the heat of battle, when the time actually came to relinquish the Ring, he would not have had the strength. That said, I'll go ahead and devil's advocate myself and point out that Isildur was obviously a very strong willed individual. After all, he saved a sapling of the White Tree at great personal peril while very young. Bilbo managed to pass on the Ring after carrying it for 61 years (albeit with help); perhaps Isildur would have been strong enough.