Well memchunkhax2 worked on 10.4 EmuNAND. (but it has been pointed out that this is to be expected)
Someone should try it with a 10.4 sysNAND though:
https://ianburgwin.net/hax/memchunkhax2-a636c1b.zip
running that memchunkhax2 debugger should give you the information you need.