Thanks to the awesome, nigh, heroic late night coding binge (fueled by Dr. Pepper and sheer body odor); One Mr. Crowe T. Robot has succeeded in doing what only one person has done before (which later broke, hence this fix):

Votekick Immunity for Donors, Clan Members & Admins on our L4D Servers!

I based this off of a plugin available on the Sourcemod forums, but extended it, allowing us to integrate it into our server's flag system without any major redistribution of flags.

So, now, when someone attempts to votekick you, you will receive a nice little message in the chat box:
[SM] "User" has made an attempt to kick you from the server!

Good hunting!