DSP with USB input

[Gregavi]

Hi, I'm looking to upgrade my 2015 Lexus RX 450h Mark Levinson audio system. My plan is to add an outboard DSP and Amp (or combo of the 2), replace the front door speaker system and the subwoofer. One of the issues with the ML system is the fact that the single USB input does not seem to support any music player other than an iOS device. I do have an iPhone and iPod Classic, but neither are my preferred music player. I have a Fiio player as my go-to music player for my car. The ML system does not recognize file that are on the Fiio, no matter what file type I load onto it (ALAC, MP3. MP4, FLAC etc.)
I'm hoping I can find a reasonably priced DSP ($400-500) or DSP/Amp combo ($600-800) that has 1 or 2 USB inputs that will support my Fiio loaded with FLAC files.
Any suggestions?
Thanks in advance.

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