I haven't found Hans' system yet but haven't given up the search yet. In case anyone else is searching, I can correct this data point.
I found a post from April 1994 on the TML by Hans were he states that his system was written up but was unpublished at that point. Here is the quote from Hans:
I believe Rancke (Hans Rancke-Madsen) put it up on this board in at least one thread, and he also published it a long time ago in an issue of either Dragon Magazine or White Dwarf (I think it was the former - it would hav been an issue from the 1980's).
I found a post from April 1994 on the TML by Hans were he states that his system was written up but was unpublished at that point. Here is the quote from Hans:
So if it was published, it was 1994 or later.I wrote an article suggesting an alternate system of nobility (The Emperor wound up as SL Y; this was not planned, it just worked out that way, but
I was kinda pleased that there would also be an appropiate SL for any rulers of whole galaxies one might encounter). I sent it to Challenge,
but unfortunately it arrived just as they closed their intake of Megatraveller stuff. Sigh... I have a suspicion that they didn't even read it.