I've confirmed that GrapheneOS boots on the HiKey 960 and provides a working adb shell and serial console. However, there's a serious issue with the graphics driver causing it to cycle the screen to black and back repeatedly. I expect it's yet another upstream use-after-free bug.
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I'm not currently interested in working on HiKey / HiKey 960 support, but it's set up with the basics working already if anyone wants to work on this. The next step would be disabling zero-on-free and the other use-after-free mitigations, or just testing with jemalloc instead.
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