Prepare for a long complicated answer 😅
The obvious low-hanging fruit is LHP Robert Gasser. He will be called up as he establishes himself. First rehab outing today was highly successful. He looked like he didn't miss a beat. Beyond that, the best pure talent has big question marks and would be major gambles given lack of experience and polish.
The real unfortunate part of early 2024 is alluded to above: the lack of a step from RHP Carlos F. Rodriguez. He is getting hit nearly every outing for an inning or two because he is inconsistent. It is just an unfortunate fact.
In terms of starting depth beyond Myers (who, as you know, is already up and who I've been saying is MLB-caliber since last September) it just really is not there. SO, we desperately need Junis back and we need Myers to stick and we need Gasser to stay healthy and pray Miley isn't seriously injured.
You can try to force some innings out of Ashby or Junk but neither guy is appropriate for that role and it would be a big risk. We can fool ourselves into thinking they are but that isn't using good judgment. Ashby is likely a year out and I implore the Brewers to let him figure his mix out and work his way back into health and effectiveness instead of insisting he get thrown to the wolves at the MLB level. He needs time. I just haven't seen enough from Junk to merit consideration beyond eating innings in lopsided affairs. He can give you meaningful innings but, again, he's inconsistent.
NOW, if that health ship rights itself, there are certainly a number of Sounds relievers who likely deserve opportunities to eat some innings up North (outside, of course, of my guy J.B Bukauskas coming back healthy and Koenig continuing to stick):
Paredes, Blackwood, Middendorf, Herget, Zastryzny likely all deserve a shot and come to mind. Possibly even Chirino if he's right.
Beyond that, there's a big bunch of talent that needs more experience and more innings. I'd opine to you, today, RHP Craig Yoho could pitch MLB innings. BUT, he's in High-A Wisconsin making hitters look ridiculous. He's not getting that call. I'd also opine to you: RHP Yerlin Rodriguez is in the Uribe pantheon of impact and 'stuff' but he's in High-A, also making hitters look overmatched, and also prone to Uribe control issues. Not ready. AND, obviously RHP Jacob Misiorowski is the elite arm higher up in the pecking order but he desperately needs innings; exposure; and polish.
SO, either they get healthy by my estimates. Myers and Gasser stick and impart impact. They call up a mix of Sounds relievers. They stay afloat and relevant gluing the greater staff together. AND then acquire arms at the Deadline. OR they start experimenting with high end inexperienced talent. That's how I see it. I personally don't see the current fringe 40-Man arms in Junk, Blalock, Ashby or Martin as the best options. I am disagreement with the Brewers there. And, that's just the way it is.