Bonnie Stewart, a longtime ISC employee, shortly after finding out about her payout.KKRWorkers at ISC got a big payout when KKR sold the company, with one worker receiving $413,000.The payouts are part of a broader KKR initiative to spread employee ownership across private equity.We spoke to three workers about the experience and how they were spending their windfall.In his 12 years on the job, Justin Berk, a 44-year-old product manager at an in…