I think I will do it rather with UE4, and do not fight with 3DGS too much. I keep doing some prototyping tasks with 3DGS/Lite-c, but on my to-do-list only 4 corresponding items remained...
I could stay, and convert my stuff to a Lite-C/C++ mix, but as I am developing something long term, UE4 is a safer choice (and in practice faster to work with on smaller projects too).