On Windows, you can open the emoji picker with Win+. or Win+, (depending on locale iirc). Then just switch to the symbols tab by clicking the omega symbol and chose å

Alternatively, you can install PowerToys, which includes a quick accentuator tool.

Hold the Combine key (Linux-only, user-configurable, usually RCtrl) and press a twice. Or Combine+a+*.

Or get a laptop with a numpad. I am so used to Alt+num that I’d donate to someone to implement it in the Linux libinput, and I’m not alone.