It's practically impossible to have drivers for all devices. it only makes sense to do them when there is an established need. To that end, an Arcam driver has just be released. Standard caveats in play. If I followed the protocol doc correctly it should discover the amps and you will have basic control. Nearly all the api commands are supported including the simulated IR commands. This should provide all the control that is needed.
I have no way of testing the driver locally. If there are issues I'll need to see the verbose event logs and, ideally, remote into your controller for troubleshooting.