Executor Reqs

I have everything else I need for the requirements excluding Piett and Boba. Fett is at R1 atm, because Piett is generally more useful to get high Relics sooner, but there has been a massive roadblock between getting him from R5 to R6. My last R8 was Bane, and that took me way too long, so what's the fastest way to get two toons to R8? It's barely even the signal data that was a pain for Bane, but I could only buy the Aeromagnifiers from the store at 1500 crystals for 5. I am not eager to spend 10k+ crystals just for Exec requirements...