Business Class RTW and you want easy *G status? Then I would go or A3 as they have very good earning rates for C and extremely easy *G qualification (20k miles per year).
If moving to North America you might also want to consider UA or AC. More difficult to get *G but (35k and 50k respectively) but still possible in one RTW.

Also, your RTW is not maxed out at all. You are waisting segments for land segments, short flights and co terminals. 31196 miles is also not a great number since you are waisting almost 4000.

So if you wanted to maximise things you can still do quite a bit.