I played S59's (original non-ferrule) 2004-2012. I loved them, but they were never very popular clubs and that is probably because they were a bit of an odd duck. Small or very small clubhead, shaping very reminiscent of other Ping clubs. Odd in that they have quite a bit of offset compared with comparable blades or players' CBs, and in my experience they launch very low. Feel is very solid but clearly a cast feel, lots in common with other Pings of that era but a bit different than other brands and definitely different than what is popular today.
Looking at the attributes you listed:
Indestructible? Yep
Looks like a more modern iron? Not to me
Thinner? Yep
Less offset? No way
Less pronounced cavity? OK, but this isn't unique
Ping addressed some of these quirks in the later models in the series, and they gradually got closer to other modern compact blades. As others have said, if you really want to go down this route, why not go with an S55? Or, why not go with something closer to a modern club, say an older Mizuno or Titleist CB?
Or this: