You should be able to get any reptuable machine shop to frabicate this for you. The trick is to find those BSPT taps and dies to make it with. Pricing around they will run about $30-$150 for the set USD. Most places that carry them are in europe but you can try
www.tapsdirect.com I know they carry the tap but it doesnt show any dies online. Once you have those, making it isnt a problem. Although its quite a lot for just a connector. If there is enough demand for this, I could make them....
Added: Just got an email from
www.mdmetric.com out of MD. Here is a price for the tap and die
1/8" BSPT tap $15.96 each
1/8" BSPT die $43.42 each
delivery: 1 wk
Added More: Good god! Just went to their site with that link, here is a direct link -
http://mdmetric.com/britcut.htm -