Kim and Cronenworth can handle 3B & 2B. Kim is signed through next season, but arbitration eligible after that for a few more seasons. Cronenworth is signed longer term, but maxes out at under $13M per season. This would allow Keith another season in Toledo to work on his game, no need to rush him, get a leadoff hitter into the Detroit lineup, and also extend it deeper down a player. Both are at or better than league average BB% & SO%, so hitters than can control the strike zone per Harris' mantra.
I have no idea what San Diego would want in return. They might like to move Cronenworth's contract because it is longer term and they have quite a few of those on the books already.