Robert Ehrlich wrote
Except for the presence of the runway instead of unlandable terrain below
the glider, this is exactly the situation of my question, and so the answer,
as I suspected, is that you are out of options.

Let me ask you this, Robert. Put yourself 5 feet above ground, 1 knot
above stall in any glider. Flaps, spoilers, trailing edge air brakes,
drag chute, or whatever. It is probably not going to be a pretty
landing, is it? About all you can do is try and get the nose down a
bit and then rotate one last time to reduce the smiting the ground
will give you. But you asked a good question.

I personally like my flapped ships. If you do put yourself in the
situation (botched flare, bounce, etc) you can also roll on a bit more
flap just before the smiting and soften the blow a bit. Assuming, of
course, you weren't already at full flap. I have had to do this twice
in my 1100 hours of Zuni flying. Once in an off-field landing on a
gusty day with a strong wind shear encounter at about 50 feet (I think
I lost 15 to 20 knots, but I was too busy looking outside to know for
sure). I stopped with the tail less than 10 feet into the field. I
have pictures to prove it. And nothing was even so much as scratched.
The other was over a runway, again involving a bit of wind shear.
Works nice. Pull and crank.

I also have flapped time in an HP-16, and an HP-14. Spoilered time
includes Ka-6 and 604, among others.

Interesting safety note for you all to think about: We have all seen
incidents involving spoilers openning on tow. I bet you have never
seen an inadvertant flap deployment on tow, have you?

Steve Leonard
Second Highest Time Zuni Pilot
(Bob Whelan still has more hours in them than me)