HOLY CRAP! Stop everything. Guy playing Chewbacca looks more like young Harrison Ford!!!!!!!!!
Look!!!!
https://www.imdb.com/name/nm6934058/mediaviewer/rm4249373952
You just have to color the hair darker and style it!
You're right, there is actually a slight resemblance. Clean shaven and with a different haircut he'd fit at least better than Ehrenreich.
On the other hand the guy is almost 7ft which makes him basically uncastable (think of him next to Emilia Clarke...).