It would be a few hours worth of work to remove the shifter and cut/weld or just bend it in a vise in two areas to bring it closer to your specification...
If you are asking about aftermarket then there is an adjustable short throw shifter available somewhere for the 323, I think from Corksport. I dont know if it will achieve what you are after though.
I would suggest replacing the shifter bushings while you are in there regardless.