Thanks @AlanRynne for the response! I will definitely introduce myself soon! 
I am considering going the complex route and making some custom C# transform components that can eat speckle base parameters.
The reason I attach properties to the line is because I have a lot of geometric data with a parent-child relationship. The great thing about speckle is that it would allow us to do hierarchical transformations, where a child geometry will transform in reference to its parent. I personally like the gameobject system in Unity, where you can nest gameobjects and set different types of transformations. They visualized the shemas here.
I was thinking of doing something similar in GH and making a component such as this:
Maybe this way the grasshopper canvas can become a hybrid of objects and data-trees, so it is easier to keep the speckle objects structured throughout the canvas.
Does this sound to you like something I should try out 
? Or do you feel like there is already a simpler solution available?