It's not just conjecture, it's complete delusion. Pakistan never committed to put feet on the ground for Iran. It would be beyond idiotic considering the state the country is already in.
And even if all logic died and Pakistan somehow sent military support, Israel and the US are more than capable enough to handle it themselves. They don't need India's support and India, being the world's poster child for non-alignment, won't give it even if asked anyway.
It might be hard to understand but India has unironically been friendly with both Iran and Israel at the same time.
Fantastic reference