Would you recomemd taking the IGI and CFII written at same time? It's still the same questions right? I am going back 20 plus years when I did the same thing. Take the FOI and walk into a FSDO and become a grnd instr with no oral. Easy Peasy.
I took my CFII and IGI when I took the instrument written. Yes, same bank of questions, and I was intent on becoming a CFII down the road.