According to the Ultrasabers FoC chart getting a blue flash with a CG main blade isn't an option -
http://www.saberforum.com/index.php?topic=3652.0Depending on how new your Archon V2.1 is, any alterations to your electronics and wiring would void your warranty.
Having said that a guy could disassemble the LED unit and re-solder the FoC to a different color - but I'd go by the chart for the best possible flash results.
If you're handy with wiring and soldering and have the right tools you could go right ahead. But I wouldn't touch any of the internals until
AFTER the warranty expires.
If modifications to this degree isn't your thing - I'd suggest re-imagining a purpose to why SRD is the perfect FoC for the best Jedi lightsaber out there.
And hey, welcome to the forums Sandico! Before posting any further - please read and check the forum rules located on the main home page highlighted in bold RED lettering. Thx!