I've taken my hacked switch and jig just fine. I don't think anyone will think anything of them. Especially since you're not importing them in bulk to the country from outside of it.
I had the same issue. I think it's because of the organization of Atmosphere's folders changes between 18 and 19.1. What I had to do to boot emuMMC was make a fresh install of Atmosphere, I deleted my old atmosphere folder and then copied the new one onto my SD. Everything worked flawlessly from...