Unfortunately, Customs will only enforce either an ITC order or "Piratical" copies (see http://www.cbp.gov/linkhandler/cgov/trade/legal/informed_...). In order to be "piratical" the copying must be pretty obvious. Unless JooJoo or FG have included source code (and I assume not, since that is the basis of the complaint), it would seem hard to convince Customs that these are "piratical" because you would not have access to source code that you would need to show clear copying.
Therefore I think the ITC action is the way to go. You can get a quick exclusion order potentially, and I would expect you might be able to get a law firm to take this on pro bono as it will generate a lot of publicity.