Well, I was planning on just calling it there, but since you were polite and I have nothing better to do I went back and gave it another go. Converted an orange guy, levelled him up 18/98/700, sent him alone and he took care of the job. It's a bit RNG-reliant since you do need to get lucky with your infects (only missed one out of five) but well within the realm of possibility, only needed to do 5 missions including the actual attempt. I went with a mix of mostly health with a bit of movement as a good cushion for getting fired at when approaching but on second thought I probably should've put it all on movement and tried my hit and run strategy to the fullest. Not really sure what to tell you other than you really milked me dry for feedback here lol, but at least the game's fun so I don't really mind going back and growing a few guys again.