Actually I have been considering to enhance the system using an Arduino controller or similar. But builing something like that and also making it reliable takes time and I had other priorities.
The passerelle has several flaws, not only the electronics.
I don’t think the sensors themselves are bad design. The connectors and wireing is more of a problem.
The current control system is crude but does the job. If improvements are made it would be in adding sensors and automate the closure/opening sequence a bit more.
In the end it would add a fairly limited amount of functionality. For me it would be more a challenge to do so then a solution to a problem. So maybe I will take it on at some point but not now.
The main problem with the thing is the ingress of salt water in the rotational actuator. I had to replace mine at 6k$ cost. Protecting it totally from seawater is not so easy.