I have tested a similar setup with a Naim nDAC. I.e. iPad/iPhone into a Topping D10s (used as a USB/SPDIF converter) and then into the nDAC.
But I found this to be very inconvenient setup with a lot of additional cables and devices. Also, I found no way to control the setup remotely and had to do everything (e.g. selecting music, play/ pause commands) on the iPad directly. So purely based on the poor ergonomics I gave up very quickly.
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