You are suggesting if I'm correct that it is not really the quality of the cushioning but the overal design of the seating, as in it is not close enough to a proper sitting room lounge chair ?
I'm not at all sure what you are planning but there are a number of European builders who have chairs to starboard and settee/dinette to port. Two builders to check out would be Malo (http://www.maloyachts.se)and
Hallberg Rassy (Hallberg-Rassy - Sturdy construction, superb craftsmanship and signature seaworthiness
Otoh, if what you are planning is what it seems on the surface I confess that to me it sounds really dumb but maybe I am misunderstanding your intentions.