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I think a problem would be Pluto not having the gravity to hang onto much atmosphere.
Not Pluto specifically, in fact "TNO like Pluto" was kind of a misspeak because mass and density are flexible. I basically just want a slightly-more-habitable place than the average terrestrial world and work backwards from there. Things like moons of gas giants are explored, but I was thinking how to make things even more remote.
How about a space station? Lot easier to keep things livable if you just contain everything. Would probably end up being easier to build a station and fly it out there than try to terraform something that distant.
Well, if you want an atmosphere to start with, might try running numbers for sulfur hexafluoride. I don't know if it'd be your best option, but I'd guess that it'd be up there if you can keep the object warm enough for it to be a gas.
https://www.epa.gov/eps-partnership/sulfur-hexafluoride-sf6-basics
I don't know how to calculate albedo, but I'm sure that there are Web pages out there talking about it.
EDIT: If all you care about is keeping the body warm via solar radiation and you don't care about it specifically using purely the greenhouse effect, you could use space mirrors in orbit.