cant even pretend to know what Liz would want, but I would think, she would want them to be shown.
The show must go on for the fans(children) no doubt
No. Let it go, it's done now.
Sure. And if they'd done that with the parent series, Doctor Who would have ended when Hartnell opted to leave the role in 1966.
Look, if you can replace the lead character of one program nearly a dozen times without utterly destroying the integrity of that show, I see no problem whatsoever in successfully utilizing the very same device to replace the lead in a spin-off series.
Would it be horribly contrived?
But no more or less so than it has been any of the other times its been utilized in any other part of the Whoverse,