I first visited a sports doctor, whom send me further to a podotherapist. The podotherapist did an analysis of me walking and over a pressure plate, a video analysis while running barefoot and checked the flexibility of toes, feet and legs.
The result of the analysis is that my landing is good. However the pressure plate showed some in-balance and the video showed that my arm and leg swing could use some improvements too plus some other small issues. Basically my body is a bit stiff and sitting all day behind a desk at work does not help. He recommends that I train my core. I could use the trainings that are described in the book:
Natural running by Matthias Marquardt. Be aware it is written in German even if the title is not. He will also send me more tips and tricks and I am sure I will have some follow-up sessions with him.
The good news is that he thinks that I just had back luck with my fractures and with training I can make my feet stronger and body more flexible. He sees no issues why I could not run a 50k barefoot in a few years from now, which is my long term goal.
By the way, the podotherapist recommends a lot of his patients to go run barefoot (or with vvf). He told me that unfortunately most do not stick to it :-( So anyone in the Netherlands (Eindhoven) that is looking for barefoot friendly
podotherapist should see him.