@flamtaps said:
Finally solved! Awesome problem, thanks! Will make a writeup when it closes
Glad you enjoyed it! 
@mysteriousP said:
That was a incredible challenge. Congrats to @st4ckh0und!But I have to admit, Iām a Ghidra fan. And with a 2nd stage disassembly, the code reveals.
Yeah, well, any technique is permitted