CMIIW, at least items a) and b) above are also present in Lumin U2? From my understanding, the SFP connection (fiber optic input) in U2 provides galvanic isolation and it uses internal LPS. I don’t know about c) though, whether U2 has patented construction and hi-end circuit solution. I also don’t know what Lumin means by “direct-coupled” USB for connection to DACs but it seems that it provides some sort of advantage against “ordinary” USB.
@Sound Eq perhaps it’s best if you could audition both (preferably at home with your own system/chain) before you decide to buy.