Not exactly a model kit, however the Hasbro U-wing fits rather well:
https://www.amazon.com/Star-Wars-Rogue-U-Wing-Fighter/dp/B01BYBV2OQ
Discussed this with some of the folks on reddit, they did the math and it comes out to 1/47.
There's a picture in the amazon reviews of it next to some old WOTC mini's, we know Legion is a little bigger than them.
Should be relatively easy to find on discount with Toys R Us going under. (RIP)
Similarly the Hasbro TIE striker should work as well. (In theory)
Edited by FlyingAnchors