Change Local Admin Password via OD?

We use a generic local admin account on our images so that we can still get on them in case of network/domain issues. Is there a good way to change the local admin's password using OD? I am trying to figure out a good way to swap out the password as we change them across the board. If OD can't do it, what is the best way to do this without having to issue a command over ARD? Thanks, Nate