The Lencarta QuadLite is the most powerful in its class. You could safely fit a gel because it's pretty cool running, but you could also remove the softbox and fit a gold umbrella instead.
Hmm... I know that that's an oblique reference to the lack of a reflectorYes. Though it's pretty useless with an umbrella - light goes everywhere, some of it even into the umbrella!
For a golden colour, just turn the in-camera white balance up to 10000K, though that will warm up the whole image, not just from the QuadLite. Or adjust in post processing.