>>Unfortunately, our reliever candidates in the minors look like a reach right now.<<
Maybe, but still, why not bring them up? Give someone like Jeremy Berg or Ryan Brasier a shot and use the Bill Veek incentive method and tell him that there's a sniper on the roof with orders to shoot if he even thinks about throwing something outside the zone.
Or just bring up Richards and park him in the pen. Plenty of other starters were developed that way. Just let him throw and give him the occasional swing start.
I dunno, seems like there's more options I'd rather go after than trade a useful piece for relief, unless we're talking about one of the top tier ones. Like Rivera. I'd trade Trumbo for Rivera if DiPoto could get Stoneman drunk enough.