kernel update question: do I have to reboot to upgrade to new kernel version in current?

My usual practice is to update in current, then reboot in order to get the new kernel version installed, then run the mkinitrd_command_generator.sh scrpt to get the modules for the generic modules identified, and then reboot again to get to the new version of the generic kernel.

Is there a way to do this "on the fly" without the two reboots?