In a 4-jet, I once rejected just beyond V1 - a large flock of birds crossed the nose and impacted on both sides of the ac. Birds had gone down 2 of the engines, one on each side. We rolled gently down the runway, allowing the brakes to cool before clearing the runway onto the taxyway at the end. The t/o was obstacle limited, which was the V1 we were using. There was no requirement to calculate the range of V1s.
Beaing in mind what happened to the E3 in Alaska, where the ac hit birds on t/o and the crew continued as per SOP and subsequently crashed, maybe the V1 range should be calculated as an aid to the captains decision-making process.
Having said all that, there is no substitute for experience and thinking about the 'what if?' scenario, discussed and practised in the simulator before strapping the flying machine to one's butt.