You are correct that for pure accuracy Taeon + Zenn would be a better combo to cap out DW but you could consider that, since the difference between the 2 is so minor, it may be beneficial to go with Mes + Suppa for the superior offensive stat.
ItemSet 341385
This is the only thing I could think of really.
So with that set, I have -5 Acc from not using Hasty Pinion, and 10 DEX from Taeon, and removed Brutal Earring for Zennoi Earring. Removed Grounded Mantle for Vell. Mantle, but added Olseni Belt to compensate for the acc I am missing from using Grounded Mantle +1.
I have the 31% DW I need on that TP set, if you include +5 DW from each piece of Taeon Augmented with 5 DW.
Does that look about right? If I wanted to make the set look cooler, and less expensive: I could prob get away with Rajas Ring and Mar's Ring. Since I doubt I'll highly ever be able to utilize this gearset since I will prob just have to stand back when my pet is dead in the first place. So Maybe I am overthinking this TP set altogether. u.u
Since I'll have Habilitator +1, thats +20 Acc already. So I could afford to remove the two Ramuh's Earring +1s, and use Rajas/Mar's Ring. (For lower Content since I doubt I'll be doing anything that requires 1300-1400 Acc anyways.
So supplemented Offhand Habilitator for Blurred Axe+1 for lower Content and will use HB+1 for anything else to fix acc.
EDIT: Changed the Set a little bit too.
EDIT: went for 30% DW since at the cost of 31% I am loosing TP gain for minimal benefits. So I changed it to your prior suggestion with the DW Earring from Azi(Can't remember the name off the back of my head.)