Searching for a mount similar to this https://www.shapeways.com/product/GS...ack-dual-mount
but instead of attaching to a rack, it has a clip that can be put on the end of a saddle bag!
I did a search on Shapeways for "varia/cygolite dual mount" but there was 1059 pages and I didn't have the patience to go through each one! If somebody has a better search term to use, that would be helpful too.

I also tried "varia/cygolite dual mount seat bag" but that got me 1062 pages!
(I can't use the cygolite's seat stay mount because of the cable to my brake.)

Actually, would the rear rack version work if I just used zip ties around it and the saddle bags blinky strap? (I'm asking in case anybody has tried it!)

Thank you.
(Very interesting thread).