Changing projection of tileset

Hi there,

I have tileset in lod2.2 generated for Mapbox (EPSG 28992). Is there any converting tool or hack how to reproject the tileset (and .b3dm files) to show them in Cesium?

I tried to read .b3dm files but couldn’t find what I have to change there.

Does anyone have an idea how to solve this?
Thanks!