Sure, they may stick their toes in the water. They did last year with Kepler (allegedly). And nobody offered anything of value (presumably).
I would think Kepler's history/consistency would bring more than a fringe/former prospect or utility player.
In other words: you're right. I bet they ask around. But I bet they don't make a move unless it's part of a larger package.
And that's unlikely. This team doesn't need to clear space on the 40-roster. There are several AAAA players they can DFA at any time (Luphlow, Moran, Stevenson, etc). Though I suppose I'm forgetting about the 100 players on the 60-day IL.