The non-American far-right may also cozy up with Islamists, as the HD-conference you cited shows. Denier Roger Garaudy even converted to Islam, so did Rene Guenon, who was all about “Tradition” and mysticism and who is adored by some of the European Right. The latter wasn’t an Islamist but a Sufi, but this shows that there isn’t really a necessary aversion. So all it depends on is what far-right group considers what group more dangerous - Jews or Muslims.