I also disliked brutalist from spending too much time in Ontario University campuses which just did a boring job of brutalist. Then i visited the barbican in London and fell in love. There are very good examples of brutalist out there
It provides some of the capabilities previously limited to microkernels in the past around the ability of an application domain to customize the kernel to fit its needs. You can see it in loadable kernel modules, user-space drivers which allow applications to control how they access hardware directly, and now loadable application code too which can run directly in the kernel.
Hybrid hasn't been used to denote something that has a address space layout similar to a mkernel so much as it's being used to denote a monolithic operating system that has some capabilities previously only available in a mkernel.
Sounds a lot like SPIN OS https://en.wikipedia.org/wiki/SPIN_(operating_system)
They have to make do without type safety (in SPIN's case provided by modula-3), but it's really cool to see it tried.
For those interested: SPIN and other hybrid kernels (like Exo) were created in the fall-out of "microkernels are bad" by attempting to allow a hybrid approach. Linux was created around the same time staying straight in the monolithic category (but since moving to be more hybrid).