OrbitalGraphs isn't quite there yet in terms of the features that BacktrackKit wants, but hopefully this isn't too far off.
In util.g, BacktrackKit, basically copies what is in ferret, but that is what OrbitalGraphs does too! So in theory we should eventually be able to use OrbitalGraphs without too much trouble.
Note that OrbitalGraphs is not currently redistributed we GAP.