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.
My husband has 4E feet, and finding safety boots that actually have a larger toe cap was impossible. A few years back this company started up here and they are great!
https://www.wideloadworkboots.com.au/
Edit to say: I just checked and they definitely come in 6E width!
Edit again to reply to OP’s deleted comment: The website lists their products, you will need to find a distributor to purchase them. :)
I hope they serve you well!