As much as I would love a more nuanced economic model (I'm an economist by trade), I think this is a solution in search of a problem. Without a more robust model like perhaps the one in Victoria, energy functions as a "maintenance" resource, and nothing more with a few notable exceptions.
To the question that spawned the original thoughts of the OP: I find it to be an uninteresting question for various reasons:
It's a purely algebraic question with multiple variables that vary on a monthly basis. Thus, the strictly correct answer to "should I specialize on energy production" is "it depends". On what?
On the relative price of minerals/food, the products that can be produced by minerals/food (i.e., a chemist turns 5 minerals, 1 food into 1 mote, which is worth twice of the total cost in energy) nevermind the fact that prices fluctuate, and so on and so on.
Separating energy from currency will not change any of this. OP's post isn't even wrong; it's a non sequitur. The original question is potentially useful to think about, but has so many solutions that I find it useless to think about without making some assumptions to narrow the set of solutions.