Yes and yes, I have both fully evolved and could breed if needed. :) I don't know offhand whether they are female, but if so, then Egg Moves can be requested again; alternatively, if you like them the way they are...or if they're male, in which case this doesn't apply...;)
I have all the DWs you mentioned in original form (read: no DW ability) except for Drifloon; however, I do have a Drifblim I can breed to acquire that. I'm in around the 300s now for breeding and leveling (all breedables in Kanto and Johto are acquired), and while I do have a "DW" box I would like to fill up, my first priority is acquiring every Pokémon in the first place. Sooner or later, I'll just have legendaries left and - while I plan to capture my own - might accept them as trades then just to complete the Dex, then replace with my own someday. :)
So all that said, I'll stick with the DW Eevee. I know I'm close to getting Bagon in Meteor Falls, so the question is whether I want to wait to import it (or import five junkers - or even different Spinda - with it to SS, then it's at least in 4th Gen.). I don't mind getting them sooner, and I know breeding rates will be identical anyhow since anything I import is still an outsider. :) Let's go ahead with Bagon, Gible (since I haven't touched Sinnoh's games yet), and that DW Eevee to go with the Shiny one I have (not to mention every individual non-Shiny Eeveelution in my PC).