To be fair even if the Brewers could afford him they probably still have no shot at any of these Japanese players. The Bucks drafted a Chinese player one time and he had no interest in playing for the Bucks. It took a lot to convince him to actually come and play for the Bucks.
For players in Japan it is Chicago, Seattle, LA and New York that are the popular places for them to play. If a team like the Brewers gave them a lot of money maybe they come but Toronto tried that with Ohtani and he took a deal with the Dodgers instead. A player who has no choice but to sign with a team in an undesirable location will do it if they have no choice but I doubt they stay long term.