Hello there. I've seen your birds are getting each day more happy. But there's something that stoop up for me. You said "We moved Kiwi to another cage due to online advice.", but you also said you purchased them both.
So, they were together when you purchased them?
You had no need to separate them and quarantine them if they were already together in the shop. Separating is if you had for example Toki for a while, then purchased Kiwi. You wouldn't know if they came from the same surroundings, therefore you should wait some time to see if Kiwi had any sickness.
Now, if you purchased them together on the same shop, none of them is going to bring the other sick.
It's okay, I think since it was already some time since you moved kiwi to another cage, it's not gonna be traumatizing to change her to Toki's cage again.
Keep posting updates! I'm happy to read it and am curious to read more!
Anyone more experienced can confirm what I said though, maybe it's best they do before you do what I said