In my opinion, save this for late 2020s or early 2030s. They are going nowhere still trying to make this happen, for several years now - when Marvel Studios is also heavily making/developing movies for Avengers, X-Men, Fantastic 4, Shang-Chi, Thor, Thunderbolts*, Sam Wilson, etc... they are simply preoccupied with other things, this simply didn't get their attention and was lost in the mix. Because if it had gotten enough attention and urgency, it wouldn't go through so much rewrites/restarts. Marvel Studios isn't that perfectionist to begin with.