As wrote, if Deltec can accept a voltage of 12v instead of 10v it can be connected directly to the ProfiLux via a GHL Breakout Box, ask them.
In the list of future features, but not yet planned, the possibility of activating a 10v channel according to a switch channel is envisaged, so what you want to do would be directly possible, but I have no date to give you, nor can I promise that it will be done.

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info@aquadepot.com.au - www.aquadepot.com.au - +61 8 9359 4660

Gaël