p.1 #1 · looking for reflector with built-in frame
Something that you could just sit on the grass or sand without bringing a light-stand. I saw a video by ben shirk where he was using something that looked a little similar to lastolyte but it had a built in column that you could use to stand it on its own without a light stand.
p.1 #2 · looking for reflector with built-in frame
is this what you have in mind? The Turf Stand is a light stand without legs; instead it has a four-tined fork that you push into the turf/sand/ground or whatever, and it holds up your reflector
p.1 #3 · looking for reflector with built-in frame
no, i have not seen the turf-stand but the stand i'm looking for has a thin, umbrella style arm connected to the frame which fits into a universal joint stand adapter or can be leaned back against the arm on the ground
p.1 #7 · looking for reflector with built-in frame
I've got Reflectasols that are thirty years old, used nearly daily. The fabric is interchangeable, reversable, and dry-cleanable. They fold more compactly than anything and collapse without requiring feats of prestidigitation.
Note, however, that simply standing them up outdoors requires zero wind.
p.1 #10 · looking for reflector with built-in frame
BTW, speaking of Lastolite: they have a product -- the UpLite -- that uses the twist-to-fold-style reflectors along with a self-supporting arm that's made to sit on the ground. You can just put a camera bag or other object(s) on it to hold it down in a light breeze.