No nro2nsp makes forwarders that forwards them using both the core nro and the rom. You just put the game anywhere on your sd card like you would for retroarch, and use nro2nsp I made a tutorial in a thread I made about this https://gbatemp.net/threads/mind-if-i-show-off-for-a-second.529674/
You need nro2nsp https://gbatemp.net/threads/legal-nro2nsp-builder.519915/
You need your switch keys (you should have them if you've ever converted an xci to nsp) they go in resources, and you find an icon of the game on google and resize it to 256x256. (just right click the image on your computer and hit edit, hit resize, uncheck maintain aspect ratio, click pixels and put 256 for both horizontal and vertical, then save) It's a gui program you hit a button beside title id and it makes a random one, app name is the name you want to call the game, author doesn't matter but it needs something like retroarch or mame for example, click on import icon to load your image you got from google, then choose retroarch core forwarder, there'll be a drop down list you choose your emulator, beside rom path just figure out where your rom is and put in the path. (must be on the sd card, obviously) I just type it in manually like /switch/mame/roms/xmvssf.zip for example click compile and it'll make an nsp that you just install normally via tinfoil.
It will load the game and the core for you you don't do anything but click on the game like any other switch game.
It sounds more difficult than it is it's easy once you get in there and try it as long as you have your keys.
You need nro2nsp https://gbatemp.net/threads/legal-nro2nsp-builder.519915/
You need your switch keys (you should have them if you've ever converted an xci to nsp) they go in resources, and you find an icon of the game on google and resize it to 256x256. (just right click the image on your computer and hit edit, hit resize, uncheck maintain aspect ratio, click pixels and put 256 for both horizontal and vertical, then save) It's a gui program you hit a button beside title id and it makes a random one, app name is the name you want to call the game, author doesn't matter but it needs something like retroarch or mame for example, click on import icon to load your image you got from google, then choose retroarch core forwarder, there'll be a drop down list you choose your emulator, beside rom path just figure out where your rom is and put in the path. (must be on the sd card, obviously) I just type it in manually like /switch/mame/roms/xmvssf.zip for example click compile and it'll make an nsp that you just install normally via tinfoil.
It will load the game and the core for you you don't do anything but click on the game like any other switch game.
It sounds more difficult than it is it's easy once you get in there and try it as long as you have your keys.
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