I suspect Lee and Davis would be appalled
That may be, but none the less, in such a TL history would record...
After Davis was captured in 1865, he was tried treason and convicted. He was executed in June 1866.
After the bloody events of April 1865, Lee was arrested and accused of treason but was not tried. He was released in 1868. He lost his right to vote and most of his family's property, including his prewar home, the Custis-Lee Mansion, which was seized by Union forces during the war and turned into Arlington National Cemetery. It was not until 1897 that the family was compensated. Perhaps, had those foulest of assassins not carried out their evil plan, Lee might have become an icon of reconciliation between the North and South, and the reintegration of former Confederates into the national fabric. Sadly we will never know.