That could work, but would it work if I had the motherboard from a New 3DS XL with Dual IPS swapped with Dual TN?https://www.reddit.com/r/3dshacks/comments/5mecnx/eshop_access_work_around_for_region_changed_n3ds/
As for swapping motherboards, I guess they mean get a motherboard from the region you want to swap to ..
And is there anyone that could do it for me? I don't want to risk destroying 2 consoles.