I’d prefer not to. Just not sold on Realmuto for several reasons.
I don't really have that big a problem with that type of package for Realmuto. Steep? Sure, but rightfully so. The thing is, if you're going to deal ready/almost ready prospects near the top of our list, you can't go halfway. Trading for Realmuto screams that you're in win-now mode, or that you're going to do what it takes to re-sign him in 2 years IMO. That kind of move takes you back where the Braves were when JS made the Tex deal and didn't follow through.
If AA thinks he's got enough pieces in place to make a serious run that he's willing to overpay for Realmuto, he also needs to add that TOR arm that JS never did. If he wants to go for it all in 2019 and 2020, it's time to also call the Indians and Mariners about Kluber/Carrasco/Paxton - even though that's not the best use of resources analytically. If you're making your move now, trade from the arms that are ready - Touki/Soroka/Fried/Gohara, and hold onto the ones that are farther away to replenish with (particularly Anderson).
Does it shorten the window? Probably, but adding Realmuto and the MOST expensive of those arms (Kluber) adds $20 million to the 2019 payroll. If you're committing to Camargo as your 3B, you've still got $20 million to spend on Brantley/McCutchen and a pen piece. If you cut Duvall and Freeman loose, you could afford to add one of those OFs and Allen/Soria/Herrera/Miller. Do whatever you have to do to keep Pache out of either of the trades, and roll the dice that he's going to keep coming fast - he could play defensively now, hope another half season of ABs gets his bat ready and he becomes your 4th OF/injury replacement after the break. That leaves you...
Ozzie, Acuna, Freeman, Realmuto, Brantley/McCutchen, Camargo, Ender, Dansby
Kluber/Carrasco/Paxton, Folty, Newk, Gausman, Julio
Allen/Soria/Herrera/Miller, Viz, Minter, O'Day, Venters, Winkler, Biddle, Sobotka
Flowers, Culberson, Tucker/Adams, cheap OF (maybe you could bring back Duvall on the cheap) until after the break when you hope Pache's ready
Again, it wouldn't be ideal as far as some are concerned, but if you could hold onto Pache, Anderson and another arm or two, and Contreras it's not like you'd be pushing all your chips in for a two year run, but everyone listed above would be controlled for those two years except Julio, Viz, O'Day, and Venters.