There's no one "right" way to deal with it, for starters. People will give lots of advice and describe a bunch of scenarios but don't feel like you "should" do it any particular way or that you're doing something wrong if you grieve in your own way.
For me, I "talk" to my dad now and then. It's been six years now and I still find comfort in doing that. I'm an atheist, I don't believe he's actually hearing me, it's just a thing I do that feels nice psychologically. I've been imagining I'm keeping him "up to date" on stuff, since one of the things I told him on his deathbed was that I'd let him know "how it all turned out" - he was always future-focused and I'm sure it annoyed him that he wouldn't be around to see it.
I wouldn't worry too much about any deep and meaningful "final words" and such, though. I think the words that were exchanged throughout life were just as important, if not moreso.
Why not just assemble all of Thomas' spare parts immediately, without dismantling the original? Same end result, should be indistinguishable.