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One should get away without the trimmer for the reference. One may also get away without the buffer after the pot.
On the other side it may be a good idea to limit wind up in case the voltage drops too low. This could be something like an OP limiting the set voltage at the switch to something like 3 times the load voltage. At low voltages the load would than turn over from constant current to constant resistance (e.g. 3 x the shunt, should be larger than shunt + FET R_on + Amp-meter).
Cheers mate.What's "REF02"?