What he advocates I think is that TC give up their Turkishness and GC give up their Greekness and REPLACE that with just Cypriot. In many ways his view in this regard are not dissimilar to those of GR here. Nor is this an approach I would not support, as if it was truly done then it would meet my personal 'acid test' of would such a solution have allowed TC to resist the imposition of enosis on them against their will, in that there would be no TC to be imposed on and no Cypriot who was just Cypriot would ever seek to hand control of their country to a foreign power.
However what the likes of Bill want to believe he advocates is TC give up their Turkishness and GC just carry on as ever.