Is there a way to replace blend files with fbx files in the Assets folder, but keep the mesh references?

Basically I want to upload models to the Asset Store, but it does not allow .blend files. I have approximately hundred prefabs based on the meshes inside the blend files. But if I replace them with fbx ones (with the same content and hierarchy of course), Every of my prefabs visually disappears, and gives "Missing mesh" error in the mesh filter component.

Is there a way to replace blend files with fbx files in the Assets folder, but keep the mesh references?