I reckon he'd go alright as a defensive back. If he's successful he could potentially earn US$10 million/year.
It would be a lot for him to take in though. Considering training camps have already started over there, and he would have to learn the entire game, I really don't think it's a possibility.
They might take him over for a training run and try out, but he won't do well.
As dukey said earlier, it would be in Inglis' best interests to join the Giants. Defensive drills would be much easier for him because their QB enjoys throwing to DB's.