What about: Senna lives, Schumacher dies?
At Imola in 94? I had Ratzenberger and Hill dying in my The Man from Sao Paulo, (rebooting this summer). ITTL, Senna living continued the pressure on investigating Benetton's traction control. Schumacher dying instead of Hill ot Senna IOTL would've curtailed the investigation, as Schumi by '93 with Prost retired, Mansell in IndyCar, Hakkinen stuck with Peugeot, Hill as a de facto tailgunner, and Ferrari in the doldrums, MSC was the #1 challenger, and you'd still see the massive overhauls in safety.
On the flipside, winning '94 in a walk, possibly the two after that, so the end of '96 would put Senna ahead of everyone in WDC's, wins, and poles, but Senna likely would've been burned out enough, (he was slowly getting there IOTL) to leave F1 at the end of his Williams contract, or do a year at Ferrari before doing something like IndyCar or endurance racing.
In The Man From Sao Paulo, Ratzenberger and Hill dying shift the focus to safety as well, but ITTL, he left McLaren after winning his third title when he found out Honda was leaving at the end of '92, going to Williams while Patrese went to McLaren. Dealing with the capabilities of the FW14/15 generation firsthand alerts Senna to the reality that it will be too dominant to last long, and suggests to Head and Newey to start looking at a parallel project for the day the electronic aids are banned. By 94, Williams is ready, but Senna's stress on safety has Williams at a weight disadvantage, (well, parity, with the traction control at Benetton), and a points system that has ties to the current format and most recent before, and let's just say I have the points already tallied, and it's very close at the end.