UART escape key combination is hard to type on german keyboards

As noted by esc_ctrl in the project's channel, Ctrl+\ is quite complicated to type on (at least) german keyboard layouts: <img width="960" height="320" alt="Diagram of a German ISO keyboard layout " src="https://github.com/user-attachments/assets/db7dc9a9-4730-4868-aef5-c1842f9a999c" /> (In this case, it would mean holding both Ctrl (Strg) and the "Alt Gr" modifiers, then pressing the ß key to type Ctrl+\) To make it worse, Apple keyboards (as found on any Mac) have a wildly different layout when it comes to special characters. Here, a backslash is typed by holding **both** Shift and the option ("alt") key, then pressing 7 (there is logic behind this believe me or not). That means 3 modifiers for Ctrl+\\. A list of special characters typable without modifiers on both regular and Apple german keyboards (umlauts included for completeness, obviously not universally viable): | < | , | . | - | # | + | ß | ´ (diacritic, triggers compose logic) | ^ (same) | ä | ö | ü | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | (This only covers de_DE layouts, not sure whether this fully applies to other layouts like de_CH, de_AT, ..., not to mention whatever Apple cooked up for those) Are any of these usable on (at least) en_ layouts, while also not having pre established semantics (e.g. editors like nano, emacs) they would collide with?