Sometimes it’s best to just let the film stand on its own, which seems to be what Power Rangers is trying (though the original cast of Power Rangers is hardly as recognizable as anyone from Ghostbusters).
For example, the new Ghostbusters had cameos from each surviving member of the original cast, and there was almost no subtlety.
While it’s disappointing that the main cast wasn’t even called about the movie, there could be a silver lining.
Usually with reboots like this, the cameos can tend to be right in your face.