Customize Linux kernel options in DTK boot iso (display updates via serial console)

I am trying to be able to reboot a server and apply all patches via a DTK boot disk.

However, I also want to be able to track and view progress so am connecting to the console com2 port.  However, the proper argument to the Linux kernel are not provided.

console=ttyS0,115200n8 console=tty0

I have a 2 fold question.

Part 1

1. Can I make the Dell Repository Manger create a boot disk with custom options?
2. Barring that, can I re-build an ISO w/ these changes in the config.

Even without modifying the contents of the ISO, every time I try to boot back into my custom image, I get a grub boot loading screen but no boot options.  The only thing that work from here is to type 'reboot'.

Is there a particular way in which I can re-build a bootable ISO from the contents of the ISO generated from Dell Repository Manager?  Technically my new ISO boots, but is not properly configured somehow.

Part 2

1. Even when using the ISO from the Dell Repository Manager, if I set the above parameters for serial console output, eventually my serial console will show the boot process and then stop at a login prompt while my virtual console through the iDRAC will show the update progress that I expect to see.  Is there a way to get this same display that is going to the Virtual Console to go to the serial console?

I am in a Linux environment, so Windows tools are not available.

Also, I am mounting the update ISO over httpd specified via racadm.  All of that seems to work fine though.