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Xicato has 4000K "artist" ones, which are something like 97+ CRI, high GAI, and high R(whatever) numbers across the range. The drawback is they cost about $30-40 each....
Yowza! I've been contemplating trying to make my own downlight using ultra-high CRI LEDs, but those prices are prohibitive.
Slightly off topic: How feasible would it be to buy an off-the-shelf bulb or downlight (preferably one with no flicker and good dimming), and simple replace the emitters (and optics, since they likely be broken while getting at the emitters)? It would sure save time trying to source a power supply, etc...