How to permanently password-protect (lock) standard RHEL7 menu entries in GRUB2 - Red Hat Customer Portal

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Issue

Goal: a Red Hat Enterprise Linux 7 system that requires manual entry of a bootloader password in order to boot any future kernels
Adding users and custom menuentry .... --user SOMEUSER directives to /etc/grub.d/40_custom per the the RHEL7 System Administrator's Guide is great, but how can you configure grub so that ALL existing & future kernels require a password in order to boot?
Preventing grub cmdline access with grub2-setpassword works, but how can we make all kernels require password before booting?

Environment

Red Hat Enterprise Linux 7
GRUB 2 bootloader

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