UPBGE is just blender with BGE restored,
it’s just like old bge - with some pretty huge changes,
KX_objects no longer have a KX_MeshProxy - instead they have a blenderObject and bpy works in game / geonodes / drivers / eevee shaders / openXR etc.
so anything you can do in nodes will work there,
we can control when geonodes update pretty fine grain now.
here is my presentation on it for blender world meetup day