The quest continues... Hopefully I should be able to find a willing trader before I am able to complete the final game on Trilogy on normal. I just finished assembling the 15 vouchers required to unlock all friend credit related content in the Extras menu, by gaining the "Exterminator" Friend Credit. I could have gotten the "Perfect Execution" voucher marginally earlier while I was disabling the second anti-aircraft turret, but that was a one-off, and that Exterminator credit can be done at the player's pace, which struck me as comparatively more attractive option in that sense. And believe me, that Exterminator credit is a lot easier to land than it looks: all the scorchbugs in the seed cycle around, so you can just stay at one spot in that cycle and blast them as they come, eradicating them all in about 5 minutes, maybe less.