Have you tried setting up an AppleScript or an Automator script?
There is a built-in group of Calendar "Events" including "New Calendar Event".
You can copy & paste, but you'd still have to edit the number.
Rather than typing, have you tried using Siri?
Lastly, I've heard good reviews of
Fantasical. However the free version may not include the function you're looking for, assuming it even exists in the paid app.
And there is also Google Calendars...