His chances of getting bail depend on the facts and record of the case. Further, in your case, he will have to satisfy the High Court that the reasoning given by the Trial Court are wrong. The offence cannot be compromised as per law. However, to work out a solution and to get a proper advice, you should meet and consult a suitable lawyer in person.
The offense under section 376 IPC is very serious in nature however if the accused proves the facts which are in favor of him then he will get the bail easily by the High Court. You may challenge the granted bail further. You can get in touch with me for further advice accordingly.