Ciao Marco,
I never user other formats in Revit to avoid larger size families and this kind of problem.
I have seen some recommendations not to explode AutoCAD files because their may create a lot f garbage, can't you create referente lines and a sweep in its place.
I have created different approach family frame, check if it is OK.
For your use, may be enough, but you can make it more complex to group the solution.
Fábio Sato
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