I know of no literature.  However, in the last century when we did 12-20 rigid bronchoscopies/week, we used Lidocaine for local anesthesia. It was not nebulized, but used with direct application to tonsillar fossa and then  by use of mirror, dropped directly into and thru the larynx.  I remember no reactions; we published a paper comparing other anesthetic agents in this manner. (If your "Administration" is making medical decisions, are they accepting moral and legal  responsibility for medial complications?)

Look for 4% anesthesia nebulized lidocaine under anesthesia for your research.  My wife is a nurse anesthetist (retired).  They did it all the time.

Thanks everyone for the help. Ian