Me thinks you are trying to copy the Airbus 'ground speed mini'
In a nut shell:
-Work out your g/s on touch down using tower wind and Vref.
-Then maintain the g/s during the approach (add on difference between tower wind and wind aloft to your normal Vref)..... Speeds may look strangely high but works nicely on the bus (automated).
** Be warned, you will not be stable at 500ft in most windy conditions**
Good Luck