It's been awhile since I modded textures/models but you can just patch your game with lumas's romfs or just extract the romfs from the game's .cia file put your modded textures/models in the right place and repack it then install
We just have to patience with the switch. It took years before the 3ds was completely blown apart. And it'll take more time with the switch because of the security. But we'll find a hole in it (The TSEC will prob be a nightmare tho)
Also for anyone who doesn't know what the TSEC is...
Don't know it this would be the place to put this but it seems that pokemon B/W B2/W2 have an AP check for custom a IR comunicator to respond and how the bootstrap a work in progress it's tripping in my test rips