Mine was knocking last year, I couldn't find the problem but it failed the mot on a faulty upper front wishbone arm. I replaced it and it solved the problem.
Don't bother with honda, as you fear they will rip you off. Get some struts off ebay and fit them if you can. I had a lot of trouble trying to fit some on an audi a3, such a tight fit, got there eventually. They don't last forever.
See what this goes for, got a few problems but over scrap value already:
https://www.ebay.co.uk/itm/284809846284?hash=item424ffd5e0c:g:v3kAAOSwxAxiQRzP
Pretty scary that. Made me take a look at my split pins today and they are fine but rusting. I might swap them over with stainless steel ones. You'd think they'd be stainless in the first place.
Sorry for the frosty welcome. No, cost is prohibitive, think about getting an egr delete and remap. Not until it happens though, may be a long way off if it's motorway miles.
You could remove the wheel bearing ***embly, this will allow you to clean out any debris and rust that may be inside the chamber where the sensor sits.
Not sure but I think part of the bearing ***embly triggers the abs.
That 1/4mm could just be the stretch from torquing on the old one, shouldn't need any washer adding but if it's worked then sound.
"can anyone provide the new/before, after/limit dimensions on them if any exist ?"
What dimensions were you referring to?
Are you sure it's the hub binding, not the brakes? Maybe try tightening as much as you can so the hub rotates, then take it for a drive, then see if it will tighten some more and still spin freely.
I don't think you will damage the hub. Try some oil as it suggests. You are using new nuts? I did a Fiat Punto rear bearing and the torque was @280 nm which I thought was crazy, had to buy a bigger torque wrench to do it.
But it was fine.