According to Nikkan Sports, it seems the Chunichi Dragons aren't necessarily hell-bent on keeping Wei-Ying Chen in a Dragons' uniform. While their goal is to keep him under contract, they appear to be willing to listen to Chen to hear out what he wants.
Dragons' owner Junnosuke Nishikawa said, "We obviously want him to return next season. ... At the end of the season, we'll talk to Chen and see what he's thinking. If he really wants to go to the Majors, then we'll have to seriously considering posting [him]."
A Sports Hochi article mentions a bit more of what Nishikawa said:
"Chen is a player on our roster. If an MLB team tries to contact him, tries to persuade him to leave, that's not something that will easily be accepted. In that case, we can always treat Chen as a retired player."
And Sponichi has a slightly different quote from Nishikawa:
"He's a great pitcher, so of course we want him to stay. But, once the season ends, we'll talk to him and if [posting] helps our bottom line, then we'll consider it."
It'll be interesting to see what the team ultimately decides when the season ends.