As much as I enjoyed seeing it in Dayton, IIRC, it was hanging above the gallery floor and certainly overshadowed by more famous/popular/historic/relevant types (in all my countless visits there, I never saw an excited youngster grab his father’s sleeve and say.. “Look, a Dh-89!).
Since it is a fairly practical type to operate, its better use is probably flying, giving people the wonderful and rare experience of flying in multi engine biplane.
With at least two under restoration the U.S., I wouldn’t be terribly put out if it was exported.
The Historic Flight Foundation’s example is being repaired (in Canada, I believe), following its 2018 accident in Abbotsford. More importantly, its pilot, John Sessions, is back flying. Once airworthy, it will be available for rides.
And the Military Aviation Museum, Jerry Yeagan’s collection in Virginia, has one. Wiki says it’s under restoration.
The FAA registration database says there are two others in the U.S., one in a collection/museum in Missouri, the other is in Texas and part of the collection which includes the airworthy Mosquito (I wonder if it makes a good transition trainer for the Mosquito?).
Also, a Dh 84 is listed.