Ultraseven, if timing is an issue it would be wise to let those who you wish to help you know a day or two in advanced that you plan to go after Chary, and when the re-pop starts. This way, they can plan, if they agree, to be free, and on call at that time.
Also, i do not know the lvls or jobs of who you are asking to help, but many people bring far more then is needed to kill him, 1 pt can do it if they have 2 blink tanks with utsu ni, it takes long but it is possible. therefore, if you have that requirement in pt already, and have others comming... do not hesitate to claim it ^^;
some people may even be willing to help you pop it

i know i spent nearly 40-50 hrs one week helping a friend of mine '-';; Good Luck with your sword, rdm's and brds are not the problem

i am sure if you try to be more orgainized you will have yours in no time.