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I wonder if a part like this would work: https://aliexpress.com/i/4000307508670.html ? This is an external part so I'm not too sure how you'd connect it to the casing.
As long as that PSU is externally controllable/programmable, it is exactly what is needed. Of course readouts of voltage & current are not required 
The key point is one needs to know how to communicate between the controller and PSU: Is it digital (I2C) or analog (0-10v = 0-100%)? Does the PSU report back to the controller to give basic status and actual voltage & current output?