Rigid version works quite well with a much lower 220'C reflow. I am using leaded solder, but I'll be trying some experiments to bring the SAC solder reflow to lower temp with a longer soak too.
We originally planned to make a low cost microcontroller version to just make pretty jewelry that integrates LEDs. Since the rigid is somewhere between this and a garment insertable panel, I figure it will most likely be used in DIY projects. I grabbed Adafruit's 5V Trinket board file and made a rough pattern for it as an optional controller. The result is available on Dirty PCB http://dirtypcbs.com/view.php?share=8802&accesskey=886f9b5b20749e82de0fed6f0aea530a . We made an order of them (obviously) and we hope to start using and selling them in a couple weeks when we get them.
I'll still be working on a smaller footprint controller with battery power. Probably based on Cortex-M0 with Tag Connect SWD pads. It will be used for jewelry and small accents. I'll post the design in a new project.