The new PS should have an 8-pin that either splits in half or can be connected to the 4-pin with the other half in the air.
You’re right, it does have one like that with yellow and black leads and I think it will snap on with half in the air. Not sure how I missed that. I’ll just make sure that the wire colors match up. Thanks!
ETA: It slides apart into two pieces!
Up and running. Hopefully for good this time.