Thanks for getting back with the update. Given your requirements, I don’t think our UD-ULTCDL Triple display dock is the right fit for two reasons.
The first is that two of the outputs (the HDMI 2K and the DVI) are driven by a DisplayLink chip, in fact the same one as is used in our UD-3900 dock so they will be subject to the same limitation I mentioned previously in regard to color calibration.
The second is that the HDMI 4K output of the dock will not connect to the DisplayPort input of your monitor. A passive cable with a DIsplayPort connector on one end and an HDMI connector on the other will not work, as the cable is only meant to work in one direction, DisplayPort to HDMI and not the other way around.
I would stand by my original recommendation of our Thunderbolt 3 Dual DisplayPort adapter in combination with our Active DisplayPort to HDMI adapter for your needs. We do have a 30-day no-hassle return policy, so it is not a problem to return the UD-ULTCDL dock to us directly for a full refund and we will even pay for the shipping. Please email your Amazon Order ID number to email@example.com and mention ‘Ticket # 158267’ in the subject line so we can match things up and we can get the process started.