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This is sort of what Mach does with "out-of-line" messages: https://web.mit.edu/darwin/src/modules/xnu/osfmk/man/mach_ms... https://dmcyk.xyz/post/xnu_ipc_iii_ool_data/

(this is used under-the-hood on macOS: NSXPCConnection -> libxpc -> MIG -> mach messages)

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Mach has always been a very interesting project. It doesn't surprise me at all to see that they have this already, but at the same time I was not aware of it so thank you. This also more or less proves that that may well be an avenue worth pursuing.

I learned of the idea from some paper or other of Barrelfish, which is a research OS based on seL4. Barrelfish is underrated! Aside from its takes on a kernel architecture, it also has interesting nuggets on other aspects of OS design, such as using declarative techniques for device management.

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