You're a talented guy. I asked Vinh to do that with an rrt-0 and he would not try. Any trouble getting it to fit?
Sunwayman C20C MTG2 mod: Took a bit of work. The star fit easily. The reflector needed a small bit of work with a handfile. Ultimately I ended up swapping out the smooth reflector and replacing it with an OP one for a better beam profile. The largest amount of work here was on the driver. The DrJones drivers I had were Nanjg 105c with custom firmware. I performed the zener diode mod using the kit from Mountain Electronics. The driver was 17mm but the space for it was 20mm. I didn't have any contact plates at the time so built my own with some sheet plastic and copper solder braid. The 17mm driver is mounted in the center with a Radio Shack tact switch right about. It works, but a genuine contact plate would work better. I have some, but haven't gotten around to remounting the driver yet. Amount of time estimated to do this mod: 6-8 hours.
Jetbeam TCR01 mod: Modding this to work with a triple was actually quite easy. Entire job only took maybe 3 hours. I used a triple Nichia 219B on a 20mm direct copper Noctigon triple star. The star was just slighly too big. It needed to be around 18mm, so I had to file the edges off with a handfile. Like the C20C, the TCR01 had a ledge halfway up the reflector compartment at just the right height for a triple. Sit the filed down triple on this ledge, insert the optic and screw on the bezel and you're (almost) done.
The stock driver wires were too short to use with the raised star. unfortunately, they're virtually impossible to replace due to their positioning inside the 2 piece driver board. I soldered additional pieces of wire onto the ends of the driver wires to lengthen them.
I also solder braided the tailcap spring (with 22 gauge wire instead of braid). Standard step to reduce resistance.
One step I didn't take with the TCR01 would be to make a slug to fill the space below the star. I've done this in previous lights by cutting copper sheet into disks then soldering them together into a slug. Properly fitted and drilled this provides additional heatsinking below the star and can help the light run at higher output longer. I decided not to do this mod with the TCR01, because of the extra time it would take, extra weight it would add, and because the light isn't really that high wattage anyways so heat isn't a big issue.