⌥ - ⌘ - K
doesn't list the 'Ken Burns'-effect as 'shortcutable' …
And I doubt, that even Automator
would createany useful 'shortcuts':
Each picture is different - so, how should a 'standardised' KB work?
What does work indeed , is copy/paste of Attributes:
create your KB for clip#1
select clip#2 (or many) hit ⇧-⌘-V and select the 'crop' attributes ...