Using an alias in find -exec

Nope, find doesn't know anything about your aliases. Aliases are not like environment variables in that they aren't "inherited" by child processes.

You can create a shell script with the same commands, set +x permissions and have it in your path. This will work with find.

find itself doesn't know anything about aliases, but your shell does. If you are using a recent enough version of bash (I think 4.0 added this feature), you can use find . -exec ${BASH_ALIASES[foo]} {} \; to insert the literal content of the alias at that point in the command line.