2:27 PM, Friday March 27th 2020
While the kinds of marks you can get out of a nib pen are similar to those you can get with a fineliner (at least I believe they are, I haven't used one myself - we're looking for rich dark marks with the ability to vary line weight with pressure), the trouble is simply that they can be a huge pain to use. They have a steep learning curve, and if a student has not had ample experience with them, then they will pose an additional barrier while working through the lessons.
For that reason, I don't recommend their use for these lessons. If you feel entirely comfortable using them, then I'll leave that decision up to you.