Today I soldered pin headers for the outputs, ground and power. I will connect the jumper cables from the back panel to them. After brainstorming for a while I figured out the input connections need somewhat different setup. They need one jumper wire per connector, since I would like to have a switch like input, so I cannot manage with common ground on the connectors. I separated the first four connectors on the back panel and each got their separate jumper cables.
Then I soldered similar circuits to the analog inputs 5, 4, 3, and 2 like I used for the push buttons. 10K resistor pull the input down to the ground. Then the same input is connected to the +5V via a jumper and a 500 ohm resistance. The jumper is then connected to the external connector. By shorting the external connector it works similarly as a push button. If a variable resistor is connected to the external connector then it works as an analog input.
Here is a picture about the board:
Analog inputs and their connections to the back panel
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