I've been doing plenty of searching, but I haven't found a supplier that makes a reducer in the right sizes; from 85mm to 3.0 inches. If you have a specific vendor or fabrication technique in mind, sharing it would benefit everyone.
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Mike I shared what I had in mind. My point is I don't think it will be all that complicated to install, a little internet research and I have found half the stuff I would need to make it work. I could recommend a person in your area but I am not sure he would be willing since he is on the ITAC. Darin is one of the best fabricators you will ever meet but he doesn't do this for a living like I do.

85mm=3.346447 If you use silicon adaptor like I posted you could get a 3.25 to 3.0 and a little WD40 it will slid over 3.346