First question: would Moriarty’s emotional range and awareness remain if he was attached to a Soong-type android?
Data, Lore, and Lal all had significant challenges with that.
I would think Lore, Lal & Data had their hurdles because Soong was himself trying to program a consciousness from scratch. Such is not the case with holographic beings like Moriarty & The Doctor. If you accept that they are somehow really conscious, then they have already somehow accidentally stumbled upon it, maybe in a similar way as the Exocomps or Wesley's nanites, or even the Enterprise herself, in
Emergence, all of whom could potentially take on a more humanoid body, if they chose to
Since real emotional awareness somehow already exists in the programming that made Moriarty & The Doctor, the need for a Soong type positronic matrix becomes completely moot. All they'd need to do is transfer it into a computer capable of running the program, which is essentially what they ended up doing with Moriarty & the Countess at the end of
Ship in a Bottle anyhow.
Even Data patches his mind into the holodeck in
Phantasms, which raises an interesting point, that Data could literally make himself into any holodeck character he wants. He doesn't have to dress up like Prospero, or Sherlock Holmes. He could literally program one to inhabit digitally.
For Moriarty, it could be as simple as taking that cube that Barclay has in his hand, at the end of Ship in a Bottle, & stuffing it into an android's head. lol
Second question: how would Moriarty “feel” as an android? I mean in the sense that he can touch and eat like a human on the holodeck. He would feel “human” there. Would he be satisfied in an android body?
Now THAT is an excellent question, & it touches on the Julianna Tainer dilemma. Does the knowledge of being artificial somehow taint the experience of being human, for someone who had thought of themselves as human? I'd say that question is specific to each individual. Soong & Data seemed to think Julianna would not be able to accept it, & should be kept in the dark about it. I don't know if I agree on that.
However, in Moriarty's case, here's a guy who already knows that he is artificial, but holds a supreme value in his consciousness & life nonetheless. I think he might be willing to live with it, especially if it's the only way to allow him to live in the real universe.
One issue is that we have no way of knowing how his consciousness will interact with hard tech. It may not interact as well as Soong's positronic matrix. It might be a more authentic experience to live as a hologram in their matrix, than to be stuffed into a robotic mechanism. So it might be a tough call, if they have to sacrifice. BUT who's to say they couldn't have it both ways, & live as a hologram whenever, & then choose to inhabit a mechanized body when the need arises?
Another danger is in the kind of power are you bestowing on someone like Moriarty, who is fairly well known for villainy, if you were to put him into a body comparable to Data's. Even if you didn't give him as impressive a body, he could just upgrade himself anyhow.
Let’s says it’s possible, since nothing indicates it not. What would be the point?
Twofold. The most important advance would be in the propagation of the android race, which in the production canon, is pretty much at a standstill, until duplication of Soong's positronic matrix is achieved, & no one, not even Data, has been able to do so. That bit is done. The birth of a real race of androids is easily undertaken
The other benefit is in how to help the accidental hologram people, like Moriarty & the Countess, or even the Doctor. If this is happening more than a couple times, it's possible these kinds of incidents could begin happening all over the place, & if we truly accept that they are legitimately conscious, sapient beings, then they deserve a real life, especially if it is within their ability to get it. Right?