Hi Falk D .
About the KL series hardware design, you can refer to this document:
https://www.nxp.com/webapp/Download?colCode=KLQRUG
Chapter 2 General System Setup (Hardware Considerations)
To the SWD interface, you need to add 10K pullup in the SWD_DIO pin.
SWD interface need 5 pins: SWD_DIO, SWD_CLK, RESET, VDD, GND.
Reset pin in the MCU side should add the 4.7K to 10K pull up resistor, and 0.1uf capacitor to ground.
About the hardware wire, it is not special, just normally wire in the PCB is OK.
Wish it helps you!
If you still have questions about it, please kindly let me know.
Have a great day,
Kerry
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