I actually managed to make some progress on this issue this morning by trying some of the recovery ideas in this GitHub issue:
https://github.com/jdkruzr/BooxPalma2RootGuide/issues/9
Using the FairPhone patched ABL, modified FRP and your misc-recovery image I was able to finally get my Go7 to boot into stock recovery.
However, I cannot get the device to accept a stock update.zip because of timestamp mismatches and if I do try to boot, the device immediately goes into dump mode, so something is still not working right.