I made sets for both my 175's...but they are a freakin pain the ass to make. Pretty much have to machine them out of solid stock. Takes hours and hours to make a set.
Frankie C. should do up some CNC files and make batches of them for various bikes...they'd sell.
I know M. Bateman has had some test casts done for 175 finned alloy flanges.
I'd want about $150 to machine a set...and I'd still be frowning when I did the work.