Indeed yes jumptheshark, I have got (and tried) quite a number of wings
Kruiser thread which you found: viewtopic.php?f=196&t=2402565
The Ketos Kruizer, a tad smaller, got more lift less loss and I can definitely ride in somewhat less wind than with the 1200 wings (Ketos 1200V2Kool or Moses Onda 633)
It is the foil, and then the board(size), which is the limiting factor regarding ultra-lightwind in my experience, and as you say slowboat, the ability to waterstart also.
As the kites we can get today, special UL foilkites or strutless or singleskin kites, can hang in less than you can ride, and sometimes less than you can waterstart.
AND, if a skilled kitesurfer, you can fly your kite even if it can not hang.
I think there will be (is) other wings similar to the Kruiser, but time will tell
Surface area in itself does not seem to be the solution, as they tend to be too draggy eventually, for creating apparent wind and wing lift, and for having fun carving.
So a 2000 cm2 SUP wing is probably not the (best) solution
I tend to use it quite some, in situations when the wind drops, I just change foil/wing instead of rigging up or changing board, like here where the wind went down close to 6 knots only, could just keep my 10 m2 onestrut in the air flying it all the time on long lines, before foiling, but once up, which was easy with this wing, it was great and felt powered and was fun
Out a few weeks ago: