If it's simply a hand controller extension cable as mentioned, it's a straight up Ethernet cable which can be had from any computer shop relatively cheap. My son runs a lot of server gear and we go for the higher quality cables from a supplier which beat most shop prices and quality. Even Bunnings sells network (Ethernet) extension cables. recent bought a few from them very cheap on clearance, we didn't need them but they are always handy (and I was wiring up a 4 or 8 camera (can't remember, it must have been the 3 or 4 days in the hot ceiling) wired security system for a friend. Though I keep 305 metre roll here for long runs, I just hate putting the RJ45 plugs on.
My method for hand controller only requires a standard 10 metre (or appropriate length). The hand controller plugs straight in Ethernet cable, standard pin outs, that's what my son and I ran out and checked. If going that route I wouldn't buy from Bintel and as mentioned FS.com do amazing quality and priced Ethernet cables.
It does seem like the method Martin suggested may be a better way to go and he also mentioned he could help with sourcing necessary equipment.
Plus Martin has experience doing it, I've only invested time looking up stuff in the past that may work for me with not a clue as to how to go about it and was offering advice on what I'd already found. No doubt there would be better methods others are using. As mentioned by others ASIAIR is great though it is only a Raspberry pi
(Maybe not, apparently they are going away from the Raspberry Pi, I haven't looked for some time) in a fancy case with power outlets, I can do all of that with my Pi 4 I already own and in my case it would be what I can do with minimal outlay using what I already have at hand being on a disability pension
Still, anyone reading this needing Ethernet or fibre cables/transceivers, I highly recommend FS.com. I have no affiliation but have purchased multiple items off them for networking. There equipment (other than the 8 port switch which has been a constant PITA and sits unused) most of their stuff is well priced and higher quality than you're going to get at Harvey Norman or any of the other major retailers, much better prices too.
https://www.fs.com/au/c/copper-patch-cords-960?65=63571
Question for Martin:
Do you use an active cable to get 10 metre runs with USB?
I know it has a recommended less than 5 metre cable length maximum.
I'll have to play with my shoestring cables I have here, I haven't even looked at them (got them used from a guy I purchased a pier from some time back, a pier still sitting in my yard waiting to be set up).