Ich can really only be killed by hyposalinity or copper-based treatments, and some other medication that I can't remember the name of right now. (Innovator will remember the name!) Anything that kills ich will kill inverts. Sooo... I can't say that either 1 or 2 is really going to do the job. Not the advice you were looking for, but that's my 2 cents worth.
Here's my choice, but it involves a separate quarantine tank:
ATJ's Marine Aquarium Site - Reference - Hyposalinity Treatment