One possibility might be to look at amazon, tehre sometimes are suppliers there with large sizes.
Another one would be to get a nice shoe...
maybe even used, a shoe that looks nice and fits the foot...
and have the sole replaced with a sole that fits.
There are shoemakers who do that.
Its possible fitting is in the vicinity of 50-60 usd.
So refitting a nice used shoe might be an idea...
hugs