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Tittle says it, I’m mostly wanting to proxy Kanan as Luke but I’m struggling to find a mini that would work

Here's a nice comparison so that you can be the judge for yourself.

https://www.dakkadakka.com/dakkaforum/posts/list/753460.page

Yeah, it will look a little off as IA models tend to be skinnier and shorter. That said though, as Legion cares only for the silhouette and base size who cares outside of official events?
There are a fair few 3d print versions of Kanan in Legion scale if that is a viable option for you.

I don't think IA models work great in general, but for a one off like Kanan as long as you get the base size right it should be alright.