My issue with Wellington isn't that it doesn't look perfectly loverly, but that the actual eating of it is something of a chore, with everything kind of flying apart as the cutlery goes to work.

I'm thinking that maybe making smaller, thinner loaves would work out better if it could then be eaten like a sandwich. That way, everything has a much higher ability to hold together. Another alternative might be making it like a toasted hoagie / submarine sandwich, between two halves of flaky bread.

Oh wow... actually it's a thing:
https://www.google.com/search?udm=2&&q=sandwich+version+of+beef+wellington