There are multiple hurdles to consider for each team involved
First, how high are the Pacers currently on Chris Duarte? He has clearly been better in recent games, and the Pacers may want to see his development through. If this is the case, the Pacers may be unwilling to part with him for a (likely) late first-round pick.
Second, are the Bucks extremely high on Nwora’s continued development? If so, they may be unwilling to send a young player to the Pacers. This of course depends on what they see as the upside of bringing in Jae Crowder. If they think it could put them over the top for a championship, they likely do it.
Third, the Suns can be a difficult franchise to work with. And they may want more than Duarte back from a Crowder trade if they are looking for draft capital. However, Duarte could possibly be a good rotation piece for a team that continues to have title hopes.
Only time will tell us what the answers to all these questions are, but it may behoove the Pacers to try and stick their nose into trade discussions between the Suns and Bucks if they can capture good draft capital.