No it won’t stack unless you have two quakes and two Hawkeyes 🤷♂️ But even then I doubt it would stack. It will increase everyone’s ability Accuracy. It won’t make stuns longer. But would increase the chance to stun or gain fury for hypes.
Hawkeye, black widow, quake and hulk will give you plenty of stun chains. And using hulk (poison immune as I’m assuming that’s why you are using hypes) can spam his sp1 and probably hit off a stun every time.