My situation is similar, started on pc but migrated to switch to help the playerbase during launch window. I've bought plat on pc since then (during sales), but my main is switch. I'm currently waiting on a support ticket I made with DE asking if there is anything I can do. I've had conflicting comments from people regarding trading items / plat to another account and back to keep them after the Link overrides my pc save being against tos, so even knowing that for sure would be a help.