if they are "in a good mood" it's possible. I did it a few years ago when I was on my first 2 year permit And it's correct, they cannot do but they changed both 2 year permits in 5 year ( it was even in the first year ) and then got the international Guess this is no "general rule", maybe I was just lucky, but you can always try ..
you don't need 2 months 800 K in bank when you apply for non o Same day is ok but it has to stay 3 months or more after ( 3 months after year extension from non o )