Input method: I see this as fundamentally a keyboard input method that needs to be resolved for your setup overall. Not a Raku issue. For now I'm settled on three alternate methods (under linux). The Compose key method, mostly for accented characters. The editor's code point method, in vim Ctrl-v u or U (but you need to know the unicode code point and I don't exactly have them memorized). Or copy and paste from some web character chart. Since this is programming and not texting emoji, I'd rather have a specific, chosen code point so I tend to use the editor's code point input. (But wait, that's not all, you need enough unicode support in your programming font - not very easy on linux.)
What's the point: Absolutely not saving typing. The point is to have a more visually distinctive notation. A math blackboard would be full of that. For example, in the code right in front of me I have a U+25C0 e2 97 80 BLACK LEFT-POINTING TRIANGLE as a custom infix operator for two specific data types. I could have overloaded an existing one... but no, the existing one still exists and it should be extra clear which one is used. When that code is in front of me, it's perfectly clear which is which. And now that the symbol is there in the code, it can just be copy-pasted. (For good measure, the unicode code point is specified in the operator's definition - but that's not necessary in day to day editing.)
What's the point: Absolutely not saving typing. The point is to have a more visually distinctive notation. A math blackboard would be full of that. For example, in the code right in front of me I have a U+25C0 e2 97 80 BLACK LEFT-POINTING TRIANGLE as a custom infix operator for two specific data types. I could have overloaded an existing one... but no, the existing one still exists and it should be extra clear which one is used. When that code is in front of me, it's perfectly clear which is which. And now that the symbol is there in the code, it can just be copy-pasted. (For good measure, the unicode code point is specified in the operator's definition - but that's not necessary in day to day editing.)