Very interesting!...I did a quick search on YouTube and watched 3 videos...2 running on air and one on steam. One stated his tryed but did not want to run, inspection revealed a slightly tight piston. A light polish and it was off and running.
If just a steam room toy, maybe fine as is...my first thought was it would be fun if the stick itself contained an air tank so you could run it for a stranger out on a walk!...I was trying to think how I could taper a copper water pipe like a pool cue for a nice look?
Also it occurred to me some practice Olympic javelins are hollow aluminium! Perhaps a section of javelin could be used. If it was ugly.... wood veneer could be bonded to it...just some early thoughts....they do seem to run and very bargain priced.