I have completed an FT8 Transceiver project which uses a uSDX Three Band Micro Transceiver.
I have placed the design files at this site.
Here is a link to a You Tube video that I prepared demonstrating my Pocket FT8 unit interfaced with a micro uSDX : Pocket FT8 Transceiver for SOTA - YouTube
The good news is that this project uses the Teensy 3.6 board which has built in ADC and DAC, so the parts count in minimal.
The bad news is that this project uses the Teensy 3.6 board which is out of stock with the original supplier PJRC.
I see that a Ali Express site in the Netherlands is offering Teensy 3.6 boards.
I hope take my SOTA rig out to Colorado and the UK this summer to see how it works.