I wonder if one of these cheap china atu's could be made to work.
They also sell the setup outside if it's box for 40bucks worth a try??
https://www.ebay.co.uk/itm/166521005922?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=Ec92ZeF4TSa&sssrc=4429486&ssuid=z3n9lCyhQEC&var=&widget_ver=artemis&media=SMS
In case the link doesn't work, search atu 100 on eBay or similar.?
