Thanks for all the hard work Puro!

I made a spreadsheet myself to compare gear choices between Allagan and Myth. With full Allagan + hero ring, you basicly have 406 acc. Assuming you want around 24~28 accuracy higher than that (Without food), these are your options:

(Stats converted to theoretical int values supplied by you for 735 avg damage with 2.35 gcd)
Myth Gloves: +15 acc -2.2 int
Myth Belt: +11 acc -2.2 int
Myth Chest: +34 acc -4.8 int
Myth Head+Chest: +19 acc +0.85 int
Myth Gloves+belt : +26 acc -4.4 int
Myth Head+Chest+Gloves: +34 acc -1.35 int
Myth Chest+Gloves+Pants: +25 acc -0.46 int

Depending on whether you plan to Always use food and depending on what the real accuracy cap is for t5, there are 4 really good choices:
Myth Gloves: +15 acc -2.2 int
Myth Head+Chest: +19 acc +0.85 int
Myth Head+Chest+Gloves: +34 acc -1.35 int
Myth Chest+Gloves+Pants: +25 acc -0.46 int