There are plenty of acceptable options at 3B without getting exotic.
We don't need an all star and don't really have the assets to obtain one. What we need is adequacy at the third base position. An all star would be great but all we need 3B to be is something other than a sucking chest wound.
Going back to an offseason idea of Moonslav's, picking up Todd Frazier from a White Sox club going nowhere would be a solid idea, I doubt he'd be too expensive considering he's on the last year of his deal on a losing team and the White Sox are considering a transition to Yoan Moncada at his position, and we've proven we can make fair deals with the White Sox. That looks like a deal that ought to be doable for a reasonable price in assets. Heck maybe the White Sox think they can save Blake Swihart.
I'm not longer a supporter of trading for Frazier. He's having a bad year, and he's historically a much worse second half hitter. His defense is still solid. He's probably better than what we have, assuming Devers is targeted for 2018, so if we could get him for cheap, which is doubtful, I might consider him.
Adrian Beltre is also a solid choice if the Rangers will spare him, he's made a strong return to their lineup after his injury and I think it's fair to say he's likely healthy, and he's been highly productive in Boston before. The Rangers are 1 game over .500 and not too far off wild card pace and they may consider themselves in contention, so that may not be an option at the deadline, but if they take a dive in the standings between now and 7/31 that becomes an option.
Will be way too costly.
Basically there's a couple things we can potentially do to increase our left side of the infield offense without screwing over an elite SS. If they fail then maybe it's time to go exocit, but the best roster moves are the ones that are least disruptive to the team, adding the most while subtracting the least, and if a veteran 3B is available, getting a SS instead fails that test.
I'm not advoacting moving Bogey to 3B, like I was when we had Iggy, but a chance at greatly improving SS defense is nothing to ignore either.