I doubt that many experienced planted tank hobbyists ever use those acid/alkaline buffers for anything, and probably have never owned any. I know I have never heard a good reason to use them. The fewer things you do to your tap water, other than adding Prime or equivalent at water changes, and routine fertilizing for the plants, the better off you will be. If you have extreme water parameters, like near zero GH or extremely high KH, you may need to "doctor" your water, but the best way to do that is to add a GH Booster at every water change, and/or dilute your tap water with distilled or RO/DI water.
If you want to use rocks that slowly dissolve in the water, you can do that by doing 50% water changes every week, as Diana suggested. Then the GH and KH should stabilize at some value that is acceptable. The dissolved minerals are just removed by the water change.