Here are some kimi no na wa body swap doujins, going roughly from better to worse:

This one has a kidnapping and a body swap:
https://exhentai.org/g/1039602/30c597181b/

This one is a body swap all the way through, unlike Kimi no Naka Wa 1:
https://exhentai.org/g/1164473/a478f238f4/

https://exhentai.org/g/1053021/556d1a015d/
This one involves the lady from the restaurant in the movie.

This one is short, alright and cheap to translate:
https://exhentai.org/g/995684/62d17d5420/

This one has okay art, but the plot is ADHD and just goes from one partner to another
https://exhentai.org/g/1073876/4684ca8115/