Perhaps if I explain the process to extract and re-package the pkg, some talented individual can reproduce this issue and identify a resolution.
Pull the AnyConnect PKG off your ISO, just mount and copy to the desktop. Open Terminal, in your utilities folder, and type, or copy/paste, "pkgutil --expand ~/Desktop/AnyConnect.pkg ~/Desktop/AnyConnect" (remove quotes, of course). Now, on the Desktop you will have a folder named, of all things, AnyConnect. Open that folder with Finder (just double click on it). Now you see the file that needs editing. After it has been saved, "re-package" the PKG with another command in Terminal, "pkgutil --flatten ~/Desktop/Anyconnect ~/Desktop/AnyConnect.New.pkg". Now, there will be a new PKG file, named AnyConnect.New.pkg, on the Desktop with the changes made. This is no longer a signed file, and if the individual performing these modifications is not an Apple developer, the PKG can still be run, by temporarily lowering the Security Settings in the System Preferences to allow all packages to be run.
Thank you for taking the time to look into this and any assistance will be appreciated.