Hey,
You obviously won't be banned from my forum for creating the Kach party, I have no problem with it. But, keep in mind that in this game Israeli laws are still valid. Therefore, creating the Kach Party will be allowed, but you likely will be barred from participating in Knesset elections by the Israeli Central Elections Committee (As Kach was in real life). Therefore, I suggest that if you want to play a Kach-style party you make its intention to expel Arabs less explicit (like the Arab parties avoid explicitly stating they are anti-Zionist, even though everyone knows they are). Alternatively you might be able to reach some sort of agreement with a right wing government to get rid of that provision altogether.