There are official ways to bypass a lightswitch by connecting wires, that way there is no risk of the power to the main dimmer being cut. However, the main unit for the KS230, and also any of other 2-way switches and dimmers will need to be installed into the wallbox that has the neutral wire. The neutral wire is a requirement for the device to function correctly as the device may degrade or burn out from power fluctuations otherwise. Most smart devices will have this requirement.

If I am not mistaken, your setup looks like it should be compatible, depending on how the lights are wired into the system. Double-check the connections with a voltmeter to ensure that the connections are correct; especially since your wires have been painted over.

Lastly, please confirm that you do in fact have a v2 KS230; only the v2 allows for the traveller wires to be crossed. The V1 requires the travelers to run parallel and will only provide power when done so.