i do not know of another safe method that will save them, take clippings and move them into a sanitary area, if you cant find someone to send you the microbial, roll with one of the other two and hope for the best. it is not likely they will survive without a strong flushing treatment, so it may be best just to clean to clean the whole area out and start anew with hygrozyme treatment from the beginning, this will help prevent future root problems and will promote good qualities.
you could try removing the plant to a dry area for a while and just with a fan and a light on underneath it to allow a bit of drying out for the roots, this may help slow the growth and even stop it, not sure though i have not tried this before, i would take a sprayer bottle filled with a representative sample from you nute rez and mist the leaves periodically. make sure your hygrozyme or hydroguard is mixed in with it too.
wouldnt hurt to treat your clipping with a small squirt here and there too, just for safety sake.
goodluck