John Ehle has been credited amongst some internet sites as an actor on Wilde. On this site, it says that he acted in Wilde, as well as directed the screenplay in the adaption of his book The Journey of August King.
Other sites confirming this are: here, here, and here, to name a few.
I cannot vouch for the reliability of this information, as I didn't notice John Ehle in Wilde and it doesn't credit him on IMDB.
Anyone who can shed a light on this subject would be greatly appreciated.