I took deliberate care to specify the terms and the concepts they correspond to, so I am confused by your statements that I was using ambiguous or loaded termin

I took deliberate care to specify the terms and the concepts they correspond to, so I am confused by your statements that I was using ambiguous or loaded terminology. I was merely pointing out that the specific tactic proposed is untenable and instead demands a different approach and primitives. As to your actual question, the underlying concept is fairly easy to do and fully supported by the hardware if done appropriately. There are no difficulties with TLB coherence because the problems are a subset of multithreaded TLB coherence, so any kernel supporting multithreading should already have those mechanisms readily available for repurposing. The only difficulty is if the software abstractions of the memory manager you are working with disagree with the concept. I am unfamiliar with the Linux kernel, but if the abstractions are wrong for the concept then you probably need to go look and modify code related to processes rather than threads.