There's an easy way to get more events than OnChange in a PCF control that's 100% supported and will continue to work, even after proper event support is added. It takes surprisingly little extra effort too—let's take a look.
https://98.codes/a-workable-pattern-for-pcf-events-you-can-use-today/
https://98.codes/a-workable-pattern-for-pcf-events-you-can-use-today/