DRL are not illegal in Japan, simply they are not mandatory.
The DRL function is hard coded into BCM software, so you need to change it to an EU model, or you can buy a DRL kit from Japan. There are various types, the cheapest is a small harness that feeds the DRL sourcing the power from the headlights height motor.
If you need it, I have a 2019 BCM module for sale, but I'm located in Italy...
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