Fortunately for Intel, going based on QVL doesn't really matter. Intel's architecture is very good and very flexible when it comes to memory speed and memory model.
Another plus for Intel, is that 3200mhz doesn't really provide that much of a performance boost vs 2666mhz. There will be some difference for sure, but I am personally not totally sure it's worth the jump. I suggest you look at benchmarks online of 2666 vs 3200.
Also a reminder, NOTHING above the 9900ks guaranteed memory speed of 2666mhz is guaranteed to be stable. So even with a moderately average speed of 3200MHz, I recommend running memtest86 and/or Prime95 with memory intensive configuration to insure stability.