Seeking Feedback on Frittata-Rolling for a Sausage Egg Pastry Roll

I started thinking about a handheld Breakfast Sandwich wrapped in Puff Pastry or Filo. But I would rather be armed with advice-based-on-experience and not jump in cold, so I am seeking your feedback.
So, my ideas are:
1) Think of the rolling involved in a multi- layered strudel filling or a Maki (roll).
-- make a 1/3"- 1/2" thick fritatta made up of just egg or egg and some minced sauteed onion.cook, cool and cut into a rectangle big enough for the following:
--At the bottom edge of the egg rectangle, place a cooked and cooled sausage, the size of a hot dog.Roll the
egg layer tightly around the sausage.
-- Roll out a puff pastry rectangle a few inches bigger than the egg rectangle was. (or make a Filo rectangle that same size, using 4-6 layers of filo, @ buttered and sprinkled with bread crumbs)
--Sprinkle over the pastry/filo rectangle some grated extra sharp cheddar or chevre or other cheese
--Place the egg/sausage cylinder close to the bottom of the long side of the pastry rectangle. Roll up the pastry, tucking under the ends.
--Egg glaze the pastry or butter glaze the filo, place on silpat or parchment lined sheet pan,and bake
til the pastry is medium brown and cooked through.

* A vegetarian version could replace the sausage with seasoned mashed potatoes

* Optional added layer:
--On top of the egg rectangle, make a rectangle of overlapping rows of paper-thin sliced potato. Sprinkle liberally w/ salt and pepper. Top with the sausage and proceed as above.

I'm curious what youall think of this.The 2 elements
that I feel unsure of - are:
--the egg layer: to be flexible enough and a good texture, should i add a touch of flour, or baking powder, or water or cream? If used room temp (not chilled) would the egg layer be flexible enough, or would it need to be briefly steamed?
--the paper-thin potato layer : Would the layer cook through when the roll is baked or would i likely need to pre-steam the potatoes? And would they turn grey if i didn't pre-dip them in lemon water?

Thanks so much for your thoughts on this! it's fun to come up w/ ideas, but in the end, the thing has to work!