What I was trying to say is, if you were going to fit a new engine into a 1*2 it's likely you'll either buy a second hand engine, or 'refresh' an engine like you've stated. If you were to go as far as you've pointed out for a 'complete rebuild' on a 1*2 then you'd have to have more money than sense, and you'd probably be better off just ordering an engine straight from Renaultsport.
Just had my engine 'freshened up' - Block honed and decked, head skimmed, new rings, bearings gaskets, bolts, seals, belts etc etc. Ok to say it would be a 'zero' miler is perhaps an exaggeration, but it would still be in much better condition than any second hand engine you'd pick up. Once run in I'm pretty sure it'll perform just as well as a brand new engine.
Just in case you misinterpret my reply, I'm not pretending to be some 'engine pro'.