Hardware retrofit OM 642

The current discussion in the diesel affair takes the form of a “exchange premium” for the Euro 5 diesel, or a hardware solution, which does not come from the manufacturers themselves. The exchange premium is again a government-funded stimulus programme for the automotive industry. Here, only the interests of the manufacturers are taken into account. It is not possible for me, because there is no car against which I have my R350 CD I want to exchange. I don’t want to exchange the SUV Panzer ala such as GL. We no longer have children of primary school age who can drive my wife into the classroom with it. Interesting for me would be the hardware solution. However, I have hardly any information. Has anyone ever dealt with it more closely and can give orientation? Greeting Hermann