I did what you’re thinking of doing. Bought Japanese waterstones, diamond plates, naturals, in all possible grits. Over time of course. After all that expense and experience I found the right combination for me was the following: an 8” course diamond plate for reprofiling (400), a 6” Dan’s “Hard Arkansas” for regular edge maintenance (roughly 1000), and a 6” Dan’s “Translucent” for whenever I want to polish an edge. The 6” stones are good for kitchen and pocket knives, 8” if only for kitchen and 4” if only for pockets. Those are my three essentials. And even at that, the Hard Arkansas get 80% of the use. Everything else is nice to have and fun to explore, but unnecessary. That’s just my opinion and experience though. Your mileage may vary.