( the pause does catch Mercy's interest, to the point that she notes it. as of yet she doesn't really think much of it, though, instead she considers carefully how to fit her words together into a coherent explanation that might make sense regardless of technological familiarity. )

Well, the most practical way this would work would only involve one change. The method being worked on involves recreating a person's consciousness by capturing all the information that makes them, them, and consolidating it. Then this is put into a mechanical body that, hopefully, would never need to be replaced.

( a much less complicated matter than something outrageous like growing new bodies to act as new hosts. )

However, I don't think many people would actually want to do this.