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It's not possible, however you COULD add a new building that modifies an existing unit to have the same stats as mounted crossbowmen. And even better, you can make it so that the building can be made by only one culture (or religion).
 
It's not possible, however you COULD add a new building that modifies an existing unit to have the same stats as mounted crossbowmen. And even better, you can make it so that the building can be made by only one culture (or religion).

Interesting idea. Could be used to represent the difference in soldiers equipment depending on culture.

I wonder if its also possible to have a building that modifies the size of various unit types based on province culture, and have it built as default.

That way someone could mod in different levy compositions and stats depending on region to make them a little more diverse like they were in CK 1.