This you put down the price listI see the point you’re making, but I don’t think they’re far enough away from that market to make it a niche market.
Golf R - £34k
S3 - £35k
Focus RS - £35k
Civic Type R - £31k
A45 AMG is a different price league to all of them and always will be.
All of the above come with most things as standard that you would want/need.
However, you HAVE to add the cup pack (at least) to any Mégane (I think most would agree), which adds £1500 to the list price.
That puts the Mégane at £30k for a manual, or £31k for an auto. Let alone adding AT LEAST £1k on for the trophy version. Taking it to £32k? Possibly.
That’s not enough distance from those cars to make it a different market.