My feet are wide and flat as a duck, and I always have trouble finding comfortable footwear.
I used to have a great pair of Engineers boots.
These were comfortable and they were the first boots I wore out.
I have been looking on and off for these for about a year.
13EE or 13 XXwide is all I can find.
Oh I just saw the 6E sorry. Honestly first if you can find a store with them give them a try because their wife really is wider than 2E. Also if I remember correctly Carolina makes one or two boots in a extra extra wide. We had one guy who needed a something like you need and I think we were able to get them from Carolina. Obviously not something anyone would have on the shelf, but it was a normal production boot. So it cost the same and didn’t need extra time for a custom boot
I think we got him these, but I don’t remember for sure. They say 4E, so not sure if they will work for you, but I do remember this guy has tried every and that was the first boot he didn’t rub this toes in.
https://www.carolinashoe.com/en/bruno-lo-6-inch-soft-toe-waterproof-work-boot-16121.html?dwvar_16121_color=Brown