Just finished building a shift extension for my T-5 (attached to a Zetec 2.0) and it works perfectly. I designed it on AutoCAD first, then built it. If anyone is interested (and I can figure out how to do it) I can post the CAD drawing and photos.

If that T5 is the same as a US T5 then I would love the drawings, Russ

I'm in Canada, so it is a North American-spec T-5 (non-world class, althjough I don't think that matters). The extension itself is made of 1/4" X 1" steel flatbar, and some DOM (drawn-over-mandrel) tubing for the shifter cup. I'll attach a few photos to my archive. I wanted mine removeable, so what fits intop the original shifter cup is a bicycle-neck-style expander I made of DOM tubing, a bolt, and a nut. Works great, holds tight, but you can get it out in 5 sec.

I've posted the drawing and photos on my archive. Here's the drawing, anyway...
Rescued attachment T5 shift ext.jpg