I have now completed Typing Club's Typing Jungle program, and can finally type with all 10 fingers. I completed the entire program within a month (taking into account a few weeks off), and reached 60 wpm in lowercase, with 97% accuracy, and 53 wpm overall. I think this is as fast, or faster than, I could go with my old method.
I'll revisit the program as needed, but right now, I'm happy to call this goal done! It is absolutely worth the time invested.