not too worried there
The vast majority of aftermarket wheels are not offered with a Subaru 56.1 hub bore. Also the tapered lug nut for a steel wheel will do the job of centering the wheel. I’m more worried about the effects of the lower offset creating a handling problem or premature wear on steering components. Wheel size notes a lot about the changes to scrub radius but is assuming the factory setup is zero. I haven’t been able to figure out if that is true or not. I’ve read that a little positve scrub radius is good but how much more is bad? Method wheels only have a 38 or 42 offset and seem to be a popular option on Subaru’s.