It is the apocalypse after all.

Yes, the new pointer goes at 99A2 in HxD. It's 83 DF because pointers are little-endian (so the high part goes first. That's that DF83 you've got in Step 2).
When you write the new raw hex code at DF83 it should end at the very end of the (second) line, with original vanilla code immediately following it.