Unless you are an actual title company, you are skating on VERY thin ice.  If you are an abstractor (as am I), the answer is simple and straightforward:  We provide information ONLY -- it is not within our job parameters to perfect title.  That is the job of a title company (with insurance to match).  We provide all the information available, but it is not our job to fix problems of any kind.  I will, of course, make suggestions and recommendations when dealing with an obviously clueless client, but I always make sure they understand that it is my OPINION only and I cannot actually officially recommend anything.  And I will CERTAINLY never write a legal description.

If this client is threatening to dump you because of this, then so be it.  The liability isn't worth it.