Switchmode converter for bench power supply
I'd use a 36-48V SMPS (or a good old transformer) followed by one of these which (on paper) should be the best option for you.

Layout needs to be perfect.

If you want to adjust the output of a DC-DC, simply inject a current into the feedback node, via a current source, or a resistor to a DAC outputting a control voltage. This keeps all feedback parameters constant, compensation is always the same. Do not use a digipot, as this will give variable gain, and thus the best compensation values would be output voltage dependent.