SS Ha-Seong Kim
The former San Diego Padres infielder has experience all over the dirt and is an exceptional defender at every spot he's played. He's also a pretty solid hitter to boot as roughly league-average offensively with a career 99 OPS+. For Gold Glove-caliber defense, the Brewers will gladly take league-average offense.
Kim is coming off shoulder surgery that may keep him out for the first few weeks of the 2025 season, but he should be good to go for the majority of the year. He's likely looking at a short-term contract in free agency because of that injury.
While the delay to his 2025 debut isn't ideal, signing Kim would allow the Brewers to explore what they have in Durbin, Dunn, and Monasterio at third base and see who from that group can prove they belong at the big league level and remain as the utility option in the infield. Giving opportunities to young players is what the Brewers like to do and a move for Kim allows them to do that while still getting reinforcements to improve this team the rest of the year.
The Brewers were rumored to be in Kim's market early on this offseason, but news has been quiet on that front ever since. It's clear that Milwaukee was interested and it would stand to reason that they'd still be interested now, it's just a matter of Kim's price tag in free agency falling to a range the Brewers are comfortable going to.
Kim could slot in at shortstop for the Brewers, pushing Joey Ortiz back over to third base for another year. He'd help backfill the offensive production of Adames a little bit, although it'll still take improvement from other Brewers hitters to make up for those 32 homers and 112 RBIs. Kim will still get them a good chunk of the way there.