I actually prefer the idea of a total reactor overhaul.
The 'core' chamber for the fuel, a series of blocks that form a thermal conductance loop; a steam generator and a 'cooling' block of somekind (which 'pumps' heat from one side to the other). Steam-power would be the 'pressure' differential in heat from hot side to cold side of a component. Insert that other proposal's different steam generator rankings here.
Actually why not just use 'machine blocks' as the conductance line?