Well yes and no, I purpose built my workstation desk (now revamped) and I do use a sliding shelf for the text keyboard and mouse . And it is very comfortable and ergonomic for me. However I have two hardware gear pieces that sit in a custom rack above the sliding shelf . Then I use a rolling/swivel office chair and have my music keyboard (midi keyboard) on it's own dedicated stand, and perpendicular to my desk, so both it and my text keyboard are at optimal height as per this photo below . But I think what you are talking could make your situation somewhat better if it got the two keyboards closer together height wise
