Those type of villain yes, I said as much, the Star Trek Universe is similar they too will meet super-beings and pseudo-gods and have to deal with them. But that's an example of fitting a villain to meet the level the given genre is set at - you absolutely could have the Enterprise or the Tardis slip into Jack Kirby's Fourth World and have a story or two there. But if you shift the narrative to introduce Orion... it starts to fall apart very quickly. Orion is a one-man army, he does not need the Enterprise or its crew. The story therefore is shifted to him.
And that;s the problem with having a superman like The Ghost operating in the Doctor Who world: you wouldn't need the Doctor to stop a Sycorax invasion - The Ghost would do it. The Daleks have a scheme for hollowing out earth's core? No match for The Ghost. The Silurians are up to mischief again?? Forget it. A Daemon is awakening in Devil's End and threatening to end the World? Well he'll be taking a sore butt home once The Ghost gets through with him...
It's a different genre The Ghost belongs in, and it is one that the Doctor Who/Star Trek universes is largely incompatable with.
I would think that could make the Ghost living on different earth like planet though, one where there are others like him about!