Hi, and thank you for you'r good work.
When I realise an interior scene, if I want to optimize my render I use a portal material for replace glass architecturale.
This method is indicated for optimize the raytracing. Consequently it's impossible to get a reflexion.
I don't know if it's possible but, like a fake shadow, that would be good than 100% to the first ray to daylight and hdri could be pass.
I d'ont know If you understand me.
THANKS