Have you guys thought about less iron specific chelators like DMSA or EDTA? They also break up biofilms by removing the metals but dont have a really high affinity for iron. But DMSA is cheap and used orally and I guess you could work up to higher doses. EDTA is harder because oral is poorly absorbed and so you need an IV treatment or suppository.
Pure iron chelators seems to be impossible to get/harder on the body.