I'm not sure this will interest anyone other than me, but I recently put together an ultra-compact double on a Stronglight 93 crank by bolting a 28-tooth 74 BCD ring to a 42-tooth triplizer ring and mounting it in the inner position on the crankarm, with a homemade chainring guard in the outer position. The bottom bracket setup was the same as for any triplized model 93. The photos below show the setup pretty clearly, I think.
I made the chainring guard by hacksawing the teeth off a worn-out and cosmetically challenged 47 tooth ring and smoothing the cut surface with a double-cut file followed by a single-cut file and some fine emery cloth. I came out looking very neat--unless you look very closely you'd think it had been done on a lathe. You can see in one of the photos that the cut-down 47-tooth ring is just the right size to cover the 42-tooth triplizer without interfering with the front derailleur.
It looks pretty good to me, and it shifts very well. That surprised me a little because the curvature of the Suntour Vx front I'm using isn't a very close match for the 42-tooth ring. Maybe that's not as important as I'd always thought.
I now have a 13-15-17-19-21-24-28 freewheel on the back, mainly because I had one lying around. That only gives me a high of about 86 gear inches, which is a little low even for me. I may ask Pastor Bob to build me a freewheel with a 12-tooth small cog--something like a 12-14-16-19-22-26-30. Another option would be a new DNP freewheel with an 11-tooth cog. But from what I've heard, the quality of the DNP freewheels isn't very good and an 11-tooth cog would give me a 102-inch high, which is more than I need.
A slightly pointless project, maybe, but kind of fun. I've always liked wide-range doubles, and this one seems to work really well.
Stronglight chainring guard small.jpgTriplized double from behind.jpgTriplized double mounted.jpg