I'm not sure a socialism that has no Marxism would be recognizable to us as socialism.
The dialectic wasn't some huge innovation in thought; we'd just associate it with someone else.
The dialectic was already seen in much of that light dating back to its use in the Socratic Dialogues.
I'd have never heard the words "Hegelian dialectic" from strange but hot looking women in college. It would have saved me hours of time.