can I trust the deformation and stress results obtained from the inertia relief?
Will I get the same deformation and stress results if I take the accelerations obtained from inertia relief and use it in a linear static structural analysis?
You can't run a static structural analysis on a model with no supports. If your model has supports, then you don't need inertia relief.
Is there a way to conduct Inertia relief ON and Large deflection ON analysis together (because that would save us time instead of re-conducting the analysis with Inertia relief OFF and Large deflection ON)?
See this discussion: