I'll be test shaving tomorrow having finished a razor on a Llyn Melynllyn using that exact set up (King then finisher) and will give you my opinion on whether the green or purple hone is the better finisher. The easiest IMO is a Naniwa 12K but they are about £70+ where as the welsh hones are around £20. The nani 12k has many users so advise on how to use it will be plentiful. The only other thing to have is a little diamond plate to raise a slurry on the 6K side to bridge the gap between the 1K & 6K sides, unless the nagura stone raises a slurry, I've not used one but I always assumed it was just to deglaze and clean the stone.