Here’s another controversial take. We did something like that before, where we excluded a group of people from society because we didn’t like them. In the US we called it “Separate but Equal” and “Jim Crow”. I think it was called Apartheid in South Africa. Now I understand you aren’t suggesting we segregate people based on their race but rather their past convictions but it is similar and will have a similar outcome. Though you may want to limit it to a specific type of crime I will guarantee that it will expand to encompass more crimes and more people will be convicted of those crimes so that they can be excluded from society as well. Even here in the US there are some Republicans talking about adding teachers to the sex offender list if they talk about the wrong topic to their students.