I would reach out to both of the captains you are working with to bring the boat home and communicate that you are interested in being trained along the way. It is probably assumed that you would like to receive instruction but just be clear what you are looking for. Assuming that both are planning to coach you up along their portions of the trip, you will have a pretty good idea of who learn best from and hopefully one or both would be good options to receive additional training from.
Like any skill in life, the ability to share it with others is totally independent from having the skill yourself. Teaching is a skill and being able to stay calm, communicate clear and timely instructions without being overbearing while operating an unfamiliar vessel in tight quarters is a tall order to fill. The captains you have hired may not have any interest in teaching nor the ability to do so but it is certainly worth looking into.
I taught part time at a sailing school for years and while it was challenging and rewarding in many aspects, one of the biggest values we could offer to students in our cruising classes was confidence and experience in docking and other close quarters maneuvers under power (we sailed the smaller boats in and out of berths). I enjoyed the challenge but it was still a challenge, I would like to think I was better than most but I had a fellow coach who really had ice water flowing through his veins and you could never detect a hint of strain in his voice. That is the quality I would look for in a teaching captain, which is hard to figure out ahead of time.