MakerProducts is now selling Female to Male Dupont Y cables along with Male to Female. You can use these to split signals directly from a Raspberry Pi, an ESP32 Wroom, or other board with header pins. You can also use them to split signal from jumpers off of your PC motherboard.
The new cables are 6.5 inches long and 26AWG. (The older ones were 10 inches long and 24AWG and had head shrink at the end).
Due to increased shipping costs, shipping is now $6 flat for USPS Ground Advantage and they are sold in packs of 6.