How to migrate from Teensey LC to Final PCB?
You can simply duplicate the parts of the circuit you are using (including the crystal). The schematic diagram is published here:
https://www.pjrc.com/teensy/schematic_lc.gif

However the microcontroller chip (Kinetis KL26 Sub-Family) is NOT available in a DIP package as DIP is a dying technology and the chip has too many pins for DIP.