Sadly 'Media Player Classic-BE' doesn't support Java menus either...This day and time mini-pc's can be bought with HDMI 2.1 ports if needed. Small, unobtrusive, with RJ45 port(s).
That doesn't satisfy the desire for using no separate devices however. and one would need a software app for playback that will bitstream Atmos. (free VLC media player will, but at least for me seems to have some problems with Java menus.)