Ariadne RJ45 port broken, possible to use BNC/coaxial instead?

[mechy]

You need these:
https://www.ebay.com/itm/265015798657
install a "T" on the Ariadne and one on the media converter. connect the cable to one side of the "T" on Ariadne and the converter. The other open end of the "T"s  get a terminator like this:
https://www.ebay.com/itm/280832236453

Wouldn't it be easier to solder in a new jack and keep using Rj45 than all this? Not sure of the style of jack you need but take a look here:
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=pcb+mount+ethernet+jacks&_sacat=0