Once again, I don't know what this line should be priced, but it seems to me that the 2-way line is a bad deal, because what you really want to bet on is "Will it be a TD or FG".
Don't tell me you are honestly worried about a safety coming up. So by betting into the 2-way line, you are basically paying for the odds of the Safety when you don't care about it. Find a 3 way line and bet the FG or TD by themselves, and you should get a better price. If a safety happens, write it off to a fluke and move on.