Combining RGB and D-RGB

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OK, I've come to RGB lighting almost by accident, so I've found my self in this situation:

I have a Corsair Graphite 780T case, with LED fans. These are not RGB, but fixed colour. They are controlled by the built-in case controller and currently that's fine for me. They run at full speed all the time, as noise is not a problem to me.
The motherboard is an Asus Prime X299-A. It has a single 4-pin RGB output and no D-RGB output. It has built-in lighting as well, which I control via the Corsair iCue software which also controls the RGB RAM.
Now the water-cooling problem: I have an EKWB block for the CPU which is 4-pin RGB, but the combined pump/reservoir is 3-pin D-RGB. That means that currently I can't use the lighting on the latter.

What the best way to control both block and reservoir? I would prefer that they are synchronised, but this is not a deal-breaker.

One obvious way would by a new block with D-RGB and a single controller for both, which would by £100-£150 at least. Yes, it depends on the model of both. This would then present the issue of synchronising to the motherboard controller. Does Corsair do such a controller? Yes, I could google it...)

Another way would by a separate controller just for the reservoir, which seems silly. And would leave the sync issue, plus yet another bit of software for a single item. Money is a consideration here, as is disruption - I've had the loop in bits twice in a month and would rather not do it again soon.

Note: I have no plans for any further lighting effects, so I only need the two channels.

Can anyone think of anything I've missed? I am assuming that the different voltages for 3-pin RGB and D-RGB means that any direct combining is likely to be Bad Thing.
 
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This is probably your cheapest option:

https://www.overclockers.co.uk/zalman-z-sync-digital-argb-controller-fg-035-za.html

But it'll only do your DRGB/3-pin/5V stuff.

I believe you can control it all from a Corsair Lighting Node Pro or Commander Pro. But not officially. Officially it's for Corsair stuff only. You would need to buy cables for each device off some chap on eBay. The cables ship from the US, with overpriced shipping ($16.50), and so wind up very expensive. It's also a bit "hacky". You set up 12V devices as RGB strips in iCue, and with DRGB stuff, you pick the closest similar Corsair product and hope it works.
 
That one of the most common solutions, but it only works with D-RGB. In the meantime I've found a couple which work with both RGB and D-RGB:

1) Lamptron, currently out of stock, and also a bit overkill, but possible.

2) DeepCool/GamerStorm, which is fairly minimalist and therefore cheaper, but only available from the rain forest, who I'd rather avoid.

I'm still deciding between those two, but thanks anyway.
 
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