In theory any country. E.g. the UK, traditional banking country.
But if absolutely not Swiss bank will open an account for your Swiss AG your Swiss AG is useless.
You picked the wrong country.
Switzerland is great if you either want to have actual business in Switzerland with a somewhat strong connection to the country or as a holding location. But for holdings in general there are better locations unless maybe all/most your important directors live in Switzerland themselves and don't want to move.
Unless you have some connection or other good reason, I would not go with a Swiss holding.
Then again, if you do, why won't a Swiss bank open an account for you?