This is deeply interesting.

I've sometimes contemplated the possibility of doing things like this to guard against memory errors causing mis-entry to particularly critical control flow paths - this is certainly an example of that. But never heard of anyone actually trying to do this until now.

A "how to write rowhammer-resistant code" writeup would definitely be useful here - even if it is definitely something people cannot do for anything, I can certainly see cases where there is a case for it.