Using the special search bar command to export the USB storage -
Then un-archiving MrPI went smoothly.
Put USBnet update_*.bin in mrpackages also.
Eject, remove cable -
Bring up KUAL, tap "install packages" -
Everything went as expected (from reading the installer's script) -
System restarted (? - well, maybe this package needed it ?)
Now hung with the restart progress bar at about 90% complete.
Time to get ahold of the MR helpdesk.
Oh, wait, that's me.

Phooey.
= = = =
I wrote and posted the above -
Reached over to pick up Kindle (and perhaps touched the screen in the process) -
And the 'home screen' appeared.
? ? ? ?
Hey, no law that the helpdesk can't get lucky.