He could have, but using Excalibur in that situation would have hit Illiya, there's lots of things he could have done. He wouldn't need UBW to create Excalibur either, he uses Rio Aius without UBW and that too is a NP.
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His original plan was to kill figure out a way to kill Shirou, let Saber make a contract with Rin, then probably help Rin win the war by helping Saber take out Gilgamesh out of nowhere when the time was right.
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That's pretty much right however I doubt he'd plan to do anything after killing Shirou. His plan was to kill Shirou and cause a time paradox that would require his erasure from the throne of heroes to heal. There wasn't supposed to be any "After Shirou". Later he realizes that reality is too resilient for this to occur and the required paradox simply wouldn't happen.
EDIT: When I was choosing my avatar, I found this...
But it just seemed too cruel.