A pull start won't help because the ECU needs power to energize the fuel pump and EFI.
If you want a pull start backup, you'll need to by a carbureted machine.
X2.
Actually, in my experience this is true if the battery is stone dead, but far more often the problem is that there isn't enough battery reserve to spin the motor over without their either being too much voltage drop due to the starter drawing so much from a depleted battery, or it just won't spin fast enough to catch. I have a backup recoil starter on my King Quad EFI and having it has served me well on occasion.
As a reserve now I carry one of those lithium battery boosters, weighs very little, can be used by others not just me, and would likely provide 20 starts for a battery such as ours.