Had a similar struggle with the German layout, but in the meantime I have moved to the “EURKey” layout. It is built in to many distros and available for Windows and Mac. It mimics a US layout while still having all the äüöß (and much more) I could ever need. Though I will say it’s only really worth it if you’re in IT or similar where you frequently need certain symbols.

That repo is much more active than I would have thought 😅 Can’t wait to see this somewhere in production