Hello @Czaja,
I understand you would like to change the input geometry of a Gh style and have it automatically updated in the objects created with that Gh style. Maybe, is this related with your request about an auto-update option for some objects in this post?
Maybe having an auto-update option in the Gh styles geometrical inputs could be useful for this purpose, would that work for you? I think this way it would be possible to have a similar interaction to the one you show here with Kangaroo.
Please, let me know about it.