Thank you for your patience. I would like to help and will be working on your answer.
I understand all of your concerns as a parent and I commend you for analyzing the situation and caring about this. First off I want to say that the fact that your son has a loving father that is in his life is what is most important. Life in this day and age is not easy. Many are struggling to survive, so I would not feel guilty for not being there when you are working. If you are a driver and are absent a few days and home others I really do not think your son will be negatively impacted. He will see that you are a hard worker, provided for them, and the took care of your responsibilities. He will appreciate this and you will be his role model. If you are spending quality time with him when you are home he will enjoy those times and that will lay his foundation. He will have a sense of security knowing that you are going to work, but will be back again. From there he will look forward to you being there and that week when you are home as well as the 2-3 days. You can enjoy a lot of quality time with him. I do not forse any issues due to this. There are many Dads who may be around more, but in reality they are just "there" and not actively participating. A situation as such would be more prone to cause issues in a child's life just as a father that is completely abent and never sees his child. Those two types will cause negative impacts in different manners.
I will answer all your other questions, but before I do I wanted to clarify what your new work schedule would be. You mentioned some changes you plan to make. Can you clarify what those will be so I can understand better and answer accordingly . Thanks