Googling led me to this page where the author had the same problem, and they found a solution in Safari Bookmarks Extractor. I can't test that it still works with version changes in both, but it probably does. Once you have your extracted bookmarks, you just use Manage Bookmarks -> File -> Import -> From File.
I have iTunes "keep my music organized for me," and as a result whenever I delete a song from the library it asks if I want to send it to the Recycle Bin. I've seen this option be absent on computers with manual file organization.