I like to use a chicken stick whenever I can, but I'd have to recommend a starter. I have helped a lot of people with OS .46 LAs and own one myself. They are reliable (other than some issues with the plastic backplate), not too difficult to start and can provide adequate power with the baffle removed from the muffler.

That said, in my experience with at least a half dozen LAs, they are not easy to flip start when cold, particularly when not fully broken in. Another important point is that, when mounted in an ARF trainer, the needle valve is often not exactly where it should be in relationship to the tank center. I say get a starter, you'll want one eventually anyway.