I PM-ed the post with the test of the Seoul Viosys led. It can certainly be overdriven.
One possibility for a 17mm driver (fits the S2+) for 3 leds is the old-school RGBW driver that was originally sold by intl-outdoor.com, but now is available at kaidomain . It has 4 individual channels but if you only have 3 leds you can connect two channels to the same led and have two output levels for that led.
Be prepared for some adventurous rebuilding the driver to find the wanted output currents for the different leds, and the current limit for the transistors may not be higher than 1.5 or 2A. But replacing a transistor for a small FET can get you direct drive and thus higher current for one or more of the channels. For information how to rebuild this driver see this thread, post 1, 11 and 14 .