Well let's not mix things up, thread opener last year asked for a dongle DAC with EQ settings written into EEPROM i assume - and these settings loaded and activated on bootup of that device inherently.
Regardless of host system used (any Android, Apple or Windows).
No apps! No APO. No real-time software processing by host system.
Processed within that dongle DAC "by itself".
And that's just the initial sticking point.
Apart from Qudelix only the (no dongle but desktop unfortunately) Topping D50 III and Topping D90 III discrete come to my mind, as of October of 2024, still.
And, sure, E1DA, but with tight limitations especially when it comes to EQ.