Leinster provide the bulk of the Irish team, as you say - and are strengthened by having one or two Munster and Nordies* thrown in.
I think the French national team would struggle right now in the Champions’ Cup.
*Is it now time to move Rory Best on? His lineout throws are always prone to error. He is a great scrummaging hooker but with one of the world’s best tight heads in the front row, is Best really needed now? Could Ireland go with Sean Cronin (more dynamic than Best now as he is younger - though his throws can be wayward too) or James Treacy?