I just tried out with two languages I speak fluently and it works pretty well.

Since it is a public instance a lot of people searching make its harder to not get blocked by Google… I prefer to selfhost mine and me the only one using it.

For mullvad I will suggest you mullvad gift cards. They can be purchased in Amazon, also what is your experience with posteo as email provider?

Nicotine+ is the way to go for this.