A button like is on the Bifrost/Gungnir DACs would be excellent, though it may have to function a bit different (deeper press likely).
Something common on many AVRs is a hard power switch that engages a stand-by mode with a soft touch actual power switch. Perhaps this is the answer. Would certainly be a statement.
Again IF it's moved, then the soft touch is an intriguing idea. However I believe it is the LG that has a similar design, with many complaints
about such soft touch not being totally responsive.
I think the most logical button would be what the Bifrost/Gungnir employ.