Selling an individual, small quantity of tobacco leaf on-line pushes the bounds of economic practicality. The record keeping, tax administration, handling labor, bagging material, shipping materials and transport costs gobble up the profit in the sale.
The economics aside, even an entire pound of one type of leaf is a randomly tiny sample of the quality and characteristics of a warehouse bale of tobacco.
The cigarette blend kits at WLT are carefully balanced combinations. Diluting them with home-grown leaf will certainly be an improvement over the home-grown alone, but not as nice as the balanced blend undiluted.
My suggestion would be to purchase at least a pound each of several individual blend components, and explore various combinations on your own. Mixing up small batches with a record of their changing proportions will enhance your intuition about your preferences.
Bob