Ayre Acoustics EX-8 and their higher priced QX-5 Twenty are precisely what you asked for - streamer, DAC, and digital Hub/preamp that be connected directly to an amplifier. Multiple inputs including Ethernet, USB, optical, S/PDIF. American made, high quality, excellent sound quality with units that often can be upgraded to later versions at reasonable prices.
I own three Ayre products and am very happy with their performance and the company’s customer support
see https://ayre.com/categories/digital/