From a nostalgia viewpoint, adding labels feels a bit "impure". You might as well want to introduce other syntactic sugar, but at some point, you're no longer writing C64 BASIC.
But what if you had an IDE with convenient/native editing support for BASIC line numbers? It could auto-number on pressing enter, and it could have refactoring/renumbering support so that you can't miss a GOTO somewhere. But you'd always see and edit plain BASIC code. It feels like that might be fun.
That would be possible actually, but it would probably require support from the IDE for letting language plugins filter which lines are shown in the editor (which I don't think VS Code supports currently). Then the line numbers shown in the editor's gutter would be the line numbers defined in your code, and if you typed a new line starting with a line number, it could insert it at the location specified by the line number.
But what if you had an IDE with convenient/native editing support for BASIC line numbers? It could auto-number on pressing enter, and it could have refactoring/renumbering support so that you can't miss a GOTO somewhere. But you'd always see and edit plain BASIC code. It feels like that might be fun.