I'm working on my Cloudlinux on digitalocean.com
i want you to forward this problem to your senior management staffs or CEO to review this case.
It will be eventually, very good for your business also
I hope i can hear the answer soon, please see this e-mail, thanks
Unfortunately, Digitalocean.com does not allow to boot custom kernel because they always boot VPS with own kernel placed on boot partition outside the VPS filesystem. It's confirmed by many links/sources, for example this one https://www.digitalocean.com/community/questions/how-can-i-boot-my-compiled-kernel-image-on-gentoo where they say "Custom kernels are planned however there is no ETA yet".
Please contact digitalocean support and tell them that you need to run cloudlinux kernel. We would work with Digitalocean support to make it possible.
Release manager, 3rd line support
Cloud Linux Inc.