One thing I wish they would fix in iPadOS/iOS is giving external keyboard same way to generate diacritic characters as macOS: hold key to see variants, then select using number.
As it is, you have to memorize Option key (‘dead key’) sequences, but these don’t work for everything (these also work on macOS, but holding the key is more intuitive and matches virtual keyboard behavior).
https://support.apple.com/guide/mac-.../11.0/mac/11.0