If you were going to engage the odious NK in debate over anything, why choose the Three Oaths (where clearly, they are going to win the debate)?
Instead, might I suggest you question their stance on these three topics instead:
1. Ahavas Yisroel. Why do they strengthen the hand of those who chas v’shalom seek our destruction and the destruction of our holy sites?
2. Emuna. Their disagreements with the secular medina are in line with what we can all relate to here on YW. That said the (growing) Jewish presence in Eretz Yisroel is the calling and the will of Hashem. That is basic emuna.
3. The mitzvah of settling the land. The three oaths only relate to conquering the land, however they should not stand in the way of Yidden fulfilling the “mega-mitzvah” of settling the land (see Ramban etc).
EDIT: In fact, better yet, don’t debate them at all.