I’d say none. It’s difficult to get another crack at the bull after a rookie contract expires. Teams would rather invest in another rookie due to the cost and potential long-term commitment or spend big in FA on an established veteran. All these guys have better odds being journeymen back ups...
If you’re saying Alt is available at 9, easy decision. Otherwise I’m leaning towards Bowers. All successful offenses in NFL stress TE and usually a two headed monster.
The only reason to trade back is if a QB is still on the board when the Bears pick. Just look at what the Bears gave up to draft Fields in the first place. Then you could target the top center in the class which likely has more impact on Caleb’s future than adding a 3rd WR.