I've done something similar a couple of times, although I adapted the somewhat more complicated instructions in the Remaster wiki. The Integrating Extensions wiki ones actually look more straightforward.
In isolinux.cfg (using vi), I added "tinycore waitusb=5" [no quotes] at the end of the "append" line and changed the timeout to 1.
I call it my "beer boot" -- push button, grab beer, use Tiny Core.