I apologize for not being able to answer your questions sooner, dan81.
The question of does shaving cause hair to grow faster, coarser, darker is still asked repeatedly. The short answer is a resounding, “NO!!!”.
The hair that you cut off above the skin is dead. Only the follicle below the skin is alive. Since you are not disturbing the follicle, you cannot affect hair growth.
Many studies have been repeated over this last century that have all come to same conclusion : there is absolutely no increase in the diameter or color of the hairs before or after shaving. Period.
The follicles must be stimulated to cause an increase in hair growth. Even if you shaved two times a day with the strength and vigor of an ox, you could not affect the growing follicle below the skin. If you see an increase in the amount of hair growth from these small dark hairs on your face, blame it on an increased hormonal influence which would have happened whether you shaved or not.
If your thinking is these hairs may change in the future, you can proceed with electrolysis to remove them now while they are smaller and less deep. Less energy is required to destroy them at this stage which is easier on your skin. Just remember to be patient and consistent until the goal is reached as electrolysis requires at least 9+ months in most cases so you can get through those hair growth cycles.