Winker isn't a bad option for the Iowa shuttle.
What is his options status, I assume he's got at least a year, based on your comment? And where is the best website for finding stuff like that? True Iowa-shuttle requires not only that you can start him there and call him up as need arises, but also that you can send him back and call him back again later.
He was pretty good two seasons ago. Basically lost three to injury, 14-15 to 2014 TJ, and then broke his elbow and lost 16. So who knows, maybe he's at a stage where he's ready to stay healthy and be pretty useful. And hopefully the Cubs pitch-lab resources can help to facilitate that. Or maybe not; I think the Braves are well ahead of the Cubs in those areas, so if they couldn't probably we can't either?