The female calf in Whipsnade might be another option for Edinburgh but she is only a few months old yet.
If Whipsnade(not Chester)are to receive female Batschi, then I think the Whipsnade female calf (asha) may well leave in due course as the indoor accomodation could be a problem. Of course they could still house more rhinos in the old houses but they are pretty poor quality and need upgrading(no indoor pools)
Time flies- asha is over a year old already- when I saw her last September she already looked about a third grown.