Thanks guys
@rony
I did think of a lower drawer, but the main deck only just clears my legs (so I actually have the right keyboard height when sitting). What I'm intending to do is put a shelf on heavy duty drawer type slides between the keyboards, so that when not in use it can be pushed right back giving a clear view of the all the lower keyboard controls. When brought forward I'll still be able to play the keys, but won't see the controls. There will be enough room on the shelf for the computer keyboard, mouse, a scribbling pad and a few other nick-knacks.
This is already proving so much more comfortable to use. The downside is that it reduces the number of excuses I have for poor work