That is an interesting one. Did they? Realistically,
A Momentary Lapse of Reason and
The Division Bell were closest to
More, a mix of songs and instrumentals without any attempt to produce a conceptual or narrative album. Making those was far easier than what was created during the 1973-1983 era, so a third one like that (or more of them) was not necessarily a Herculean effort.
In terms of other ideas, there is one I was always fond of, a post-1994 concept Mason mentioned in his book - an acoustic live album with minimalist versions of grandiose things. He also said that Gilmour "kind of did it" on his own, presumably referring to his 2001-2 concerts.
This one below might be part of that idea, Gilmour + Dick Parry playing
Shine On live, alone (the first half). There is also an acoustic rehearsal of
Echoes as a bonus on one of Gilmour's concert videos, again most likely another part of that same concept. Just imagine an LP like that, acoustic minimalist
Shine On (1-9) on one side, with
Echoes on the other. What a Floydian (whatever that means) product that would've been.
https://www.youtube.com/watch?v=0qjpOLj7WSY