Rename X items... Shortcut

Hi!

I'm trying to add the "Rename X items…" menu option to work as a shortcut in Finder.

When I select multiple files in a Finder window I would like to use option-shift-enter to open the batch renaming window.

But I can't get this to work.

I've added the shortcut to system preferences and written it as it should be written. But what should I write instead of a number, to indicate variable value?

Say I select 2 files.

The shortcut has to be written as "Rename 2 files…" in System Preferences.

This works fine.

But if I select 3 files the same shortcut won't work. I have to add or change the shortcut to "Rename 3 files…"

But of course, if I select any other amount of files, this shortcut becomes unusable again.

How to I tell Shortcuts in System preferences that option-shift-enter should work for all quantities of selected files?

"Rename [variable value] items…" is what I want my Mac to understand.

Thanks in advance

-Erling