If you use Ride (Dyalog multiplatform APL ide) it's actually very easy to input the special characters: press the character on the toolbar or use the shortcuts

If you use Ride (Dyalog multiplatform APL ide) it's actually very easy to input the special characters: press the character on the toolbar or use the shortcuts (backtick ` followed by another char, shortcuts displayed hovering with the mouse on the toolbar).