You may want to get the alignment of the rest of the frame checked as the fork was bent; you never know how much damage was done when the fork was wrecked.

For the stem, you are not just restriced to 1" stems, there are 1" - 1 1/8" converter shims avaliable, and some stems come with these, I did a similar conversion to you several years a go, as getting a nice 1" stem was impossible at the time.

Also make sure the stem you linked to has the correct handelbar diamter for your bar