Funnily enough one of your reference posts was mine, sadly i don’t have anymore help with that blueprint as it was quite a while ago, however, i just put this example together which you might find useful.
The “editor Cube” being your object you wish to rotate.
Only thing is when using “mouse y” or “mouse x” in a BP it appears that the character can no longer use it which is odd, if anyone can chime in on that, that’l be great.
I hope this is atleast slightly useful.