Yes, you can customise your KiwiSaver balance using a mix of the Kernel funds.
When joining the Kernel KiwiSaver Plan, you will select how you would like your balance to be allocated (either towards one diversified fund or customised, to a mix of the Kernel funds).
You will be given the option to split your KiwiSaver balance between funds, according to percentage amounts, which is how your balance upon transfer, and any new contributions will be invested.