The most natural trade right now would be Justin-Henry Malloy for a reliever. I'd hate to see him go, but if the Tigers don't have room for him on the roster even while two outfielders are hitting under .200, and Carpenter is on the IL, he's got no future here. I'm sure another team will be interested in a guy whose AAA OPS the last three years are .892, .860 and .927.
The other obvious potential trade is Hao-Yu Lee. He's blocking Max Anderson, and would be hard to move to another position while maintaining any value. Lee is only 22, so has some trade value. I'm not sure you could get a decent middle reliever who is under team control straight-up for Lee, but you could definitely get a rental (soon-to-be free-agent), or a salary-dump older guy.
The two together would make a decent package to get a reputable player with some issue - i.e. too expensive, too little control left, or only average.
Max Anderson could be trade-bait too, for the same reason. He's blocked and young enough to be attractive. With Gleyber Torres not under contract for next year, I'd rather keep Anderson. But you have to give up something to get something.
I think packaging Malloy with Anderson should get you a competent player without any baggage.
What I'd really like to see is a blockbuster deal for a top flight centerfielder. That could include Max Clark. Could we package Clark, Anderson and Malloy for a Corbin Carroll or Jackson Merrill? The Padres probably aren't selling. The Diamondbacks might be.
Michael