Found a great stylus alternative. The Palm Tungsten styluses fit perfectly in the Treo. They are slightly larger than the treo stylus when stored - so stick out a little (much less than the ariel and not a problem). Also, they are telescopic, so expand to be about 2cm longer (same size as an m100 stylus).

This means they are MUCH more comfortable to use.

As a bonus - the tesescopic spring feature is really fun to fiddle with for hours in boring meetings..

Only downside is that there is no reset tool - so I have to leave a paperclip in my sim cover.