I have one sitting in my garage though 
Well of course you do, your Tardis-like garage seems to house examples of every 126 related variant known to man!!
Seriously, I'm surprised, given that the 126 wasn't Fiat's most prolific selling model, that the size of the German market was big enough to warrant all the extra design and production tooling costs to make a special version.
OR... given that they did make that investment, why not then roll it out over all markets, so as to improve the environmental credentials of the marque?