Awhile back, I proposed a Wiemer for Miranda (and probably plus) deal. I think it makes sense for both teams.
Strong disagree on Julien, I think he's borderline untouchable from the Twins perspective. His defense is shaky at second but good lord, that bat and discipline. His discipline is elite with his absolute refusal to swing at balls out of the zone but also has pretty good power.
As for Polanco, I think there's a pretty good chance the Twins are looking to deal him and if the price is right, I'd definitely want Polo on the Brewers. He gets injured too often, is getting older, but takes professional PAs and is a really nice stabilizing force in a lineup.