Jay there are many "free" solutions to your problem.
// The manual method
{
If you are comfortable with programming, you can hand-write a SBP file to cut a dimple to your specifications with a ball nose bit.
Then you can set up a master file and call the dimple cutter as a subroutine at each of the locations you want your dimples.
If you want to try this method, I can write more info.
}
// Using PW3D
{
Download a copy of Sculptris (its free). Draw a dimple to meet your needs.
Save the file as type "OBJ". Import into PW3D.
Toolpath the dimple
In PW import the PW3D file and place it each place you want a dimple on your workpiece.
}
There are more methods of course, but one of these two should get you to your destination with no further expense other than your time.
D