Initially a little lido would make this better tolerated. After a number of exposures humans develop a tolerance for ammonia. Also, higher levels are tolerated by the human body than are allowed in the USA.

There are also certain disease conditions that might be temporarily induced that result in higher ammonia levels in the blood stream.

http://www.ncbi.nlm.nih.gov/pubmed/556417

WHO approved this in the beginning of September. They are ramping up to do this but are taking a while due to the considerations you mentioned. It should be happening faster.

It is ironic that survivors are shunned and unable to find work, when they could be such a rich resource to save others.