Immersion, i+1, and mining

I think this is an excellent idea, especially the “simultaneously” part. If you are not a superhuman with infinite resources of time (and brain), this will probably slow you down wrt WaniKani, especially in the higher levels when you get lots of reviews from the lower levels on top of your daily load. But that’s okay because I believe that you will get a lot more out of your Japanese studies when focusing on all parts of the language at the same time (at least grammar, vocab and kanji).

For immersion, it’s a frequent complaint that the materials geared towards early learners are quite boring. Therefore I second what others here said and what you also said: Learn from what interests you, and you will get a lot more out of it, even if it’s more difficult. If you are looking for inspirations on what to read, here are some suggestions:

Happy studying!