Yes, maybe Zellij using Wasmer is great, don't know. I commented because as someone who don't follow the rust ecosystem I was curious if there was something not as big and complicated as google's v8 engine for running sandboxed code.
But it seems you should not use wasmer for running untrusted code or binaries.
I also don't know enough about rowhammer, or security exploit of any kind really, to answer the question about how you could use them against a terminal multiplexer.
These screens are expensive but also very nice.