I meant to reply to this a lot sooner, but life's been busy.
As soon as I saw LSA's post, I was out the door to get a new parakeet, and I missed the part about quarantine. However, both birds have a clean bill of health, so crisis averted there.
My new bird, Lemon, loves Kiwi very much. They are super adorable together, and the bigger cage came in so they have plenty of space. Kiwi didn't seem to know what to do with the toys, but Lemon's shown her how to play with/on all of them.
Lemon's wings were clipped, so he can't fly around like Kiwi can and has to climb the walls to keep up with her sometimes, so I was thinking I'd let his feathers grow out. I know they're at risk for escaping with their feathers grown, but because I have dogs there's no way I would let them out unless it's a very controlled environment, so I think that'd be okay.
Still having trouble getting them to eat veggies, but it's a work in progress.
They are great at sharing toys, not so much food, so I've got multiple food containers in there for them. I'm also learning how to make homemade perches, but there's been a few hiccups with that, so I may buy them one to have in the meantime.