I have to disagree with you on this, Peafowl are so susceptible to illnesses so if they are wormy also you may find yourself with a dead pea.It is not recommended that you use fenbendazole during molt.
http://parasitipedia.net/index.php?option=com_content&view=article&id=2699&Itemid=2987
This has been mentioned before and thing is no one here has stepped up to back up these claims, not saying they never happen but all of us here are and have learned many things about our birds together and i have yet to read where any one has had problems with birds molting, but have read many times about birds dieing cause folks did not know about the importance of keeping them wormed i have over 200 birds here about 75 are peafowl and all of them have and do make it just fine threw molts