[bazzite-nvidia] How to switch to a custom kernel (cachy or TkG for example)?

Hi! I tried to switch to a custom kernel following the process from the official kernel-cachyos repo on the COPR (https://copr.fedorainfracloud.org/coprs/bieszczaders/kernel-cachyos/).

I land on an error: check the attached screen below. What is the right way to switch kernel? Thanks