First, I wished I could ~, then I find out I hope ~.
First, I wasn't sure if I really wanted to ~, but now I definitely want to ~.
「〜出来たらいいながいつの間にかなりたいに変わった。」は、
First, I wished I could ~, then I find out I hope ~.
First, I wasn't sure if I really wanted to ~, but now I definitely want to ~.
などで、どうでしょうか?
近い例文になるか分かりませんが、例えば、
「英語が話せたらいいなが、いつのまにか英語の先生になりたいに変わった。」
First, I wished I could speak English, then I find out I hope to be an English teacher.
First, I wasn't sure if I really wanted to speak English, but now I definitely want to be an English teacher.
使われるときのヒントになればと思います^^