I didn't want to clog up the thread, but I feel like your idea is good to just use the nature to swap stats, but at the same time the main idea itself already had issues with the code and I feel like this may be even harder to code. I will definitely look into it if I end up officially taking over though n_n Your idea may also make Nature Swap essentially a more restricted Stat Switch :o
I'm not really too interested in Battle Spot but I love joke threads like that so I'm glad I read it just so I could see that
the answers to the second question were really interesting to me too, it's pretty neat how sets that seem bad at first glance can actually be good in a different environment imo