Add precision to XYZ to GEO component

Currently the output of XYZ-GEO is in Decimal degrees with grasshopper's standard six decimal places. This limits the precision of real world data to about 10cm. My application generally requires 1 cm level precision and site surveying is often in the mm's.

Is there some trick for more decimal places in grasshopper.Maybe within only certain functions? Or if all else fails, how might one go about changing the format of XYZ-GEO to output coordinates in degrees minutes seconds so that more of the numbers are on the left side of the decimal. This could easily give 1mm precision that most all modern RTK and DGPS equipment is capable of.

For quick reference the gHowl XYZ-GEO GitHub

and formula for DD to DMS conversion under 

Coordinate format conversion