What is the concept of an all-in-one product? Will this be a match to the Eversolo Play (the version with the integrated CD drive) with balanced outputs? Not at all sure about the need for MM/MC inputs as these are best suited to a phono pre-amp. Too many functions in one box will eventually impact the sound quality if if there is not sufficient separation and shielding between the analogue and digital circuits. Space for a sufficiently large capacity SSD (4Tb perhaps) would be an added bonus. As the name suggests, a player should include a respectable amplifier.
An alternative is a product somewhere between a streamer and a network player, with balanced outputs, space for a SSD, a DAC and, most importantly, a screen. Existing amplifiers then provide the power.