To be honest, when I've looked at various regimes I've always said it's what actually works for the objectives of the country in question. What works well federally here in Canada may not work even within some of the provinces. When I've given advice to other countries that have looked at the lobbying regime and the great model we have in Canada, it's that it's a question of what works.
I think, before changing the Canadian model or putting the Canadian models in common, it would be a question of what objectives were wanting to be accomplished that would mainly determine what the model should look like.