Boehler antinit anticorro is almost stainless in the sense of resistance to oxidation, therefore hard to blue. The advantage of choosing such material is its resistance to internal as well as external rust.
I have seen a couple of Swedish Flodmans with stainless barrels. The way they got round the bluing was to paint them with epoxy paint.
As far as sleeving goes the major advantage of high grade steels is in the weight saving hence the retention of the balance close to that of the original pre sleeved state. There is an interesting chart published by CIP on the minimum wall thickness per steel grade. The highest grades allow thinner therefore lighter walls.
It might even save the resale value if the quality of the steel could be certified and stamped on the tubes. Between original but thin barrels and sleeved with high grade steel the choice seems to be obvious for knowledgeable buyers.
