What if you do one nail at a time? I tell Boo exactly what is going on (he used to bite when we'd cut his nails). I tell let him know that we're almost finished and when he gets really squirmy, I say "Just one more" and then I do one more nail and then let him go. Sometimes it helps if they know exactly what your intentions are.
So if you say to Odin, "We're just going to do one, ok?" and then you do one and then shower with cookies, then the next day, say it again, maybe the one nail will eventually be worth all the cookies and he'll let you do two.