Please, can you add these already flat, but not so simple v12 icons back to the "flat" v13 icon set? Don't replace new ones, just add them as an alternative?
Or add a separate icon preset with v12 icons.
Or publish v12 preset outside of DOpus and post it here.
...Or, if everything mentioned is not possible at all, then please, can you make refresh icon more smooth/better anti-aliased? The smaller version of this icon is very rough looking right now.