Exchange Elements by new Imports

[ngong]

By parsing existing code, I managed to import interfaces and data-types.
However, I found my current procedure to import a new version of the same interfaces and data-types too complicated and not automatic enough.

What would be your solution or recommendation to achieve a somewhat automatic solution?

Kind Regards, Rolf

p.s. for re-engineering I am using SRCML, as well as libclang, resulting in XMI for import.
My current procedure for exchange is: in the model flag old elements as "old" by changing the name, import new elements from XMI, and do the exchange manually. I am also omitting elements from the import-XMI that already exist in the model by the same name and type.