The thing about Leylandii is that it's fast growing and grows to enormous heights - it's the nature of the plant. You may be able to find an evergreen tree to replace it, but it won't be a Leylandii. Bluespruce may be able to help - or Anchorman, as he used to grow evergreen trees, amongst others, commercially. But rid your mind of the word "Leylandii" - it's not what you're looking for.

"Fastigiata" in the name of a tree indicates that it grows to a narrow column. I have a slow growing Abies koreana that will have blue cones when it's old enough. It is growing slowly - at the moment anyway.

Here are some used in Arizona:
Juniperus chinensis 'Blue Point', J. scopulorum 'Blue Heaven', J. virginiana 'Blue Arrow', Chamaecyparis lawsoniana 'Pelt's Blue' (preferably on C. pisifera rootstock)