You're right. Most Umbreons I run into are typically Impish since Umbreon doesn't normally run into situations where it gets Foul Played or confused but Bold is definitely the optimal choice on this set. Edited it in.
name: Bulky Yawn
move 1: Foul Play
move 2: Yawn
move 3: Wish
move 4: Protect
ability: Inner Focus
evs: 252 HP / 252 Def / 4 SpD
Umbreon's impressive bulk and typing allows it to effectively spread status with Yawn and be a physical wall. Foul...
I already updated the OP for Close Combat in favour of Focus Blast since it has been too unreliable in my experience. Aura Sphere is far too weak to the threats it is targeted towards, most notably Tyranitar and Snorlax. Close Combat hits both of those much harder.
So after looking at nouthuca and finding some top placing teams with Kommo-o on it, there was only 2 teams on there (no surprise to me Kommo-o is kinda bad...) with Kommo-o on it and neither of them ran a set similar to what I have posted above. The two sets on nouthuca were offensive DD...
Clefable does not have access to Unaware yet, its HA is not obtainable ingame. I haven't seen too much of Clefable around yet in cart but I do think it has the potential to be great with an offensive LO set with Magic Guard.