My wife has abducted our children to a country which I feel is anti-Israel. I understand that the Hague Convention proceedings have been started here, but are very very slow. Is there any legal action I can take in Israel to help my case?

Yes, apply for an ex parte order from the Family Court in your home area declaring Israel to be the children's country of habitual residence, and stating that their removal was wrongful. This can be submitted to the court abroad hearing the case.