You are right about the potential for drying out the goat cheese.
Try putting it under the other ingredients.
Leeks, mushrooms, bacon, thin sliced potatoes, even whole tomatoe chunks or strips will provide protection from drying.
You can also pull the pie just before it's fully cooked, do a crumble or whatever , and put the pie back in just enough to melt the cheese without drying it out.
Perry