One thing to note is that you can fake Indirects with material emmiters.
This is how the early fake GI renders was made with scanlines before radiosity was interiduced.
So as long you have a basic knowledge where light would infact bounce, you could add helper ommiters.
The technic is ancient but extremly efficient.
A good idea would be to render an indirect illumination pass in the host app which you would use as a guide to add the 2-3 most dominant factors in.
Not you enricocerica
Just talking in general technics using Direct light modes with helpers.