Focal Sopra 2’s and a nice sub to get down to to where the 2's can't reach is the way I’d go.
The OPs post is specific to the Triton Reference, not the T2. The T Refs get down to 12Hz on their own and without the need for an external sub. The Focal 2 only goes down to 28Hz so I suppose a sub would be needed to achieve the same bass response. I guess the real cost difference is even greater than $5K.