Insert only selected blocks from external file

Hi, I have an external file that contains a number of blocks. If I try to insert that file as linked block, I get one “super” block instance with no possibility to move or switch visibility of the original blocks. Is it possible to insert only selected blocks from an external file?

File model.3dm contains 4 blocks named sphere, cube, cylinder and cone.
File linked.3dm contains linked file model.3dm. I want to be able to select only e.g. cube and move it, switch its visibility or hide or make it visible.

If you would save every block as independent .3dm file, this would work.