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I have come up with an easy workaround that will lessen your burden with three (3) easy steps using keying_sets to do the coyping of data path.

1.) Right click ( RMB ) the property to drive then select Add to Keying Set
2.) Replace CUSTOM_PROPERTY in script with the name
3.) Run Script

This will automatically add a driver to the property you have right clicked and is driven by the custom property CUSTOM_PROPERTY. Note that the script will only run if you have done step 1. It automatically removes the keying_sets after execution. Also note that if this thread can be answered then we can eliminate step 2 and it's fully automated.

import bpy
import re

CUSTOM_PROPERTY = "Surface Emission"

# First right click property and select "Add to Keying Set"
ks = bpy.context.scene.keying_sets[0].paths[0]
ks_use_entire_array = ks if ks.use_entire_array else False

modifier_id = re.findall('"([^"]*)"', ks.data_path)
is_modifier = len(modifier_id) > 0

if is_modifier:
    dpath = ks.data_path.split(']')[1]
    dpath = dpath[1:len(dpath)]
    DATA_PATH = dpath
else:
    DATA_PATH = ks.data_path

INDEX = -1 if ks_use_entire_array else ks.array_index

modifier_id = re.findall('"([^"]*)"', ks.data_path)
is_modifier = len(modifier_id) > 0
MODIFIER_NAME = modifier_id[0] if is_modifier else ''

obj = bpy.data.objects['Cube']

if CUSTOM_PROPERTY in obj:
    print("WARNING: to prevent overwriting custom property, substituting with data_path name")
    CUSTOM_PROPERTY = DATA_PATH

bpy.ops.anim.keying_set_remove()

obj[CUSTOM_PROPERTY] = 1 # you can add the custom property like this

if not obj.animation_data is None:
    drivers = obj.animation_data.drivers

    for d in drivers:  
        if d.data_path == DATA_PATH:
            obj.driver_remove(d.data_path, INDEX)

def create_driver(fcurve, obj):
    d = fcurve.driver
    v = d.variables.new()
    v.name = "myvar"

    target = v.targets[0]
    target.id_type = 'OBJECT'
    target.id = obj
    target.data_path = '["' + CUSTOM_PROPERTY + '"]'
    d.expression = "myvar"
    return target

if is_modifier:
    mod = obj.modifiers[MODIFIER_NAME]
    fcurve_or_list = mod.driver_add(DATA_PATH, INDEX)
else:
    fcurve_or_list = obj.driver_add(DATA_PATH, INDEX)

if type(fcurve_or_list) is list:
    index = 0
    for fcurve in fcurve_or_list:
        target = create_driver(fcurve, obj)
else:
    target = create_driver(fcurve_or_list, obj)