I think I'd better clarify here.
When I spoke about "all other" considerations being in play, I didn't mean to suggest that the Speed Assist and the Axis could be regarded in the same manner. So yes V100, the 710 and the Leek are different, as you say.
But I'm not confident that helps you. If the Canadian experience is anything like Au, or other places in the world, even in the US it seems, then the Leek is 'trouble' - despite what the law might seem to be. Customs here do not like these. All they have to do is find A reason in the wording of the legislation, to focus on and thereby prohibit. Doesn't have to be centrifugal force, so I wouldn't be too hung up about that. In the case of the Leek, the usual reason given is 'assisted opening'. Centrifugal force, on the other hand, was the reason indicated as being the problem in the case of that 710. But the anomolous thing about that was, these will generally be okay, even in Canada it would seem.
It is not clear to me whether this court case you speak of was a Canadian one. If it is, then obviously that is going to have a lot of bearing and may decide the problem in your favour. If it isn't, I'd be pretty concerned myself.
I'm saying this isn't as clear cut as you might think. If Customs gets a set against a knife, then the likelihood is you do have a serious problem. So careful how you go.