there's no problem with withdrawing the 10k as long as it doesn't put you under 800k, which has to be in your account for 2 months (3 in some places) before you apply for the extension, it has to stay there for 3 months after and can't go below 400k at any point
I also use the 800k method. The letter for the 65k method is different and actually lists your overseas transfers. The only difference seems to be my immigration (thankfully) doesn't want to see the bank book updated every month and prefers 12 months statements to verify I honoured the terms of the visa
Anonymous participant if you want to apply via Madrid then you need to be in Spain on the day you apply so you can't apply while in China. You also need to remain in Spain until the application process completes
I only update my bank book once a year, usually on the day I go to immigration so I always need 12 months of statements. It's the only day in the year I set foot in my bank.
the guarantee letter is only confirming the funds on the day it is written. They will need statements to prove the seasoning and usually an update bank book on the day