What I mean by "recognize" is, does GSX allow pax to use the self contained ladder without use of the GSX ladder?
Of course it does but, rather than saying "recognize", it would be best saying "supports, after doing a proper airplane customization, if the airplane used is not included in the GSX internal database".
Since I'm sure you already know that airplane is not already internally supported by GSX, because you made a custom configuration for it ( otherwise it won't work at all ), the only thing missing now, is reading the GSX manual at Page 54, the chapter named "Embedded Staircases", which explains exactly how to do that.