You're on track then! :) If you don't need the voltage divider to pull 3.3V separate from the Pi, I would avoid it. If you want to solder the in-between board, don't let me stop you! Practice is practice! What I would probably do is just us something like the 5 pole one of these: https://www.amazon.com/AUSPA-Lever-Nut-Assortment-Connectors-Pack-30pcs-x/dp/B06XP8J311