A workaround is to add the channel number to the front of the Channel Name.
In Std View > Devices > TV > Options > Edit Channels (or similar), I believe you can edit the diaplay name of the channel. Perhaps this will help? (You may need to start with 01 or 001 if you have that many channels, try it out).
The "Next" and "Previous" buttons would step through the channels in that order too, then.