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 )
the same First you apply for non o, ( 3 months ) after 2-3 months you can extend that for 1 year 400.000 for marriage or 800.000 retirement In that period that money has to stay After 3 months, in case of retirement, you can go to 400.000 and if you want to extend after one year again, the 800.000 has to be in the account for 2 or 3 months that im not sure, before the day you want to extend
I don't know where you did it or where you have the information I'm 100 % sure that the money has to be in your account the day you change tourist visa or exemption into non o Then it has to stay untill you apply for the 1 year extension, 2-3 months later