I do this too, the recent MacBook chargers have 2 usb-c and I have 4 of the plug parts that adapt it. Very minimalist but for short trips with single charger it is great
This might if you’re from the US as I’ve collected the ends over time, but I’ve never seen them for sale except the US one: AC Power Adapter Wall Folding Plug Duck Head,US Standard Plug Duck Head Compatible with MaBook Pro Air/Maci Book/Phone/Pod Power Adapter Brick