Does anyone have a better method for creating a Dim to the Length of a Fit Spline?

I'm asking because the Path Length tool doesn't seem to be available for 3D sketches and Fit Splines can't be dimensioned. 

My method is this:

1. Create a 3D sketch with a Fit Spline

2. Exit sketch

3. Create a reference Dim of the spline under Annotations

4. Create a Global Variable equal to the Dim for use elsewhere

This method works, but it bothers me to have a single annotation dim floating around inside the part; especially when all of my other dimensions typically sit in a few master sketches at the top of the tree.