improvised screamer?

on the rare occasions that i rope-solo, i build a screamer (backed up
with the rope) into the anchor before i take off.

on occasion, i have had to rope-solo unexpectedly, and may not have had
the screamer on hand. however, i still wanted some way to soften the
catch a little.

my first idea was to improvise some sort of high-friction device, maybe
something comprised of a munter or a handful of wraps around a biner,
all backed up with the lead line of course. if i fell, it would slip
giving me something similar to a dynamic catch.

i think this woudl be better than nothing. however, i thoguht of
another option and i wonder if you folks-with-more-knowledge-than-me
could tell me why it would, or woudln't work, and if there was a better
option.

a month ago, for shits and giggles, i pull-tested to failure a lot of
thin accessory cords, from 4 to 7mm. i videotaped them all, and noticed
that the failure mode for these cords was to stretch enormously, like
200%, before breaking.

i always have two loops of 5mm cord, and a loop of 6mm on my harness
when im climbing. could i put a loop of 5mm cord inline with the anchor
(of course, yet again, backed up with the lead line) as a disposable
screamer, of sorts? perhaps 4mm would be better, so it would 'activate'
at lower loads. or there could be a cascading series. a 3mm loop, a
longer 4mm loop, and a yet longer 5mm loop. adding a foot and a half of
3 and 4mm accesory cord to my multipitch kit woudln't hold me back.

or perhaps it would be better to have a cascading series of
like-diameter. a short loop of 3mm, then a longer 3mm loop, then a yet
longer one, which would result in a more linear increase in
'activation' forces.

thoguhts? idle speculation? informed musings?

.