I have 120 star save in sunshine as well. I deleted it trying to fix the save for 3d all stars. I'm not entirely sure what happened, but I hex edited a save (might've been the complete one from gamefaqs) into a memory card image. it worked with 120 shines in one save, 3 in another, and no save in the last slot.
I think the galaxy save may work if we can figure it out. I think the wii and switch saves are the same size. it can be installed through save manager gx, since the save is a non compressed save with no banner, but it seems to corrupt the save afterwards.