I am not sure the point given the hassle of postage.

I imagine that most people already have some kind of USB-Serial solution to configure the rest of their kit. If so all they need is one of these: StarTech GC98FF DB9 to RJ45 Modular Adapter.

Got to be better than faffing around with posting cables surely?

Anthony.

Sources: MS600, Fidelity Audio Reference Oppo UHD-203, Roon/QNAP, AppleTV 4K
Processors: Arcam AV40, 271 x2, Lumagen 5348 with Keces P8
Speakers: DSP7200SE FL/FR, DSP5200SE VC, DSP3200 x11, DSP320.2 VOG, DSW x4
Display: JVC DLA-N7 with PK-EM2, Panamorph Phoenix Pro, 128" 2.37 Curved Silver Ticket AT Screen