From previous experience of keeping motorbikes, if someone really wants to steal it there is nothing at all you're going to do to stop them.
I'm fairly new to all this and don't have any gear yet but when I had bikes it was always a case of a good ground anchor, a good quality chain and then either piling stuff in front of the bike to make it awkward to get to and wrapping it in a tarp or plastic sheet using bungee cords to secure it (this makes a ton of noise when you try and take it off) Thieves don't like making loads of noise and they don't want to do any work to get to what they're trying to steal, if you make access very awkward all but the most determined will give it up as a bad job.