I don’t get your issue with modifiers such as alt-gr. I grew up with a mix of Swiss (swiss qwertz) and French layout (azerty), and have my own custom layout since around 10 years, all of them require to use modifiers just to write my main languages and that hasn’t been an issue since I was a kid. If you use a non US layout it’s very likely that you already use modifiers quite often, I don’t understand why that would become an issue once you start writing code.