[LAU] USB audio interfaces with more than 16 digital output channels ?

Hi, i'm currently looking for interfaces that have more than 16 digital outputs for higher-order ambisonics applications. One of my requirements would be that they work with recent laptops, that is laptops that don't have expresscard or firewire interfaces, as those unfortunately aren't built any more. I've stumbled over a LAU post from 2016 where options were discussed. There's the DiGiCo UB Madi that is reported to work, but the price is ridiculous, and also it seems rare/hard to be obtained or even out of production. The RME Madiface USB aren't working at all (tried one of them myself). So, the PCIe and ExpressCard versions of the RME MADI interfaces have been reported working, but has anybody ever tried to use them with USB-to-PCIe or USB-to-ExpressCard adapters? Otherwise, ase the market brought forth new options ? Any advice is appreciated ! Best, Niklas -- Niklas Reppel www.parkellipsen.de