[mountainb]

You can file for a declaratory judgment and ask for attorney's fees under the fee-shifting provision of the copyright act. Generally, most of the quasi-DMCA programs also observe the counter-notice process, which gives the plaintiff ten business days to file a lawsuit, but then cancels the informal copyright complaint if the time period ends without that lawsuit being filed.

In this case, sending a counter-notice (free), filing for a declaratory judgment and asking for an injunction to prevent additional malicious filings would probably be the most direct pathway to relief.

Filing bar complaints isn't likely to work all that well, because it doesn't really map to the typical things that state bar associations really look to pursue. The vast majority of bar complaints result in nothing, and most of the ones that are deemed valid result in mandatory CLE rather than more substantive penalties.