DIY - Pressurized Hydrogen at Home?

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I found a dealer who sells Nafion membranes covered with carbon-Pt meshes for electrodes so I was thinking of buying one and assembling a cell for a project.

I've been using Soda (NaOH) + Aluminum Foil (Al) and Water (H20) to generate Sodium Aluminate and Hydrogen. It works well enough to generate pressure and fill baloons. The problem is that I need to carry more in less space, I need it pressurized.

I've found a guy on youtube who made the exact same reaction inside a fire extinquisher (reagents were added by unscrewing the valve) and that's probably the next darwin-award winning idea I'm going to try.

I'm looking for alternatives to CO2 car fire-extinquishers, other types of readily availible pressure cans I could use, perhaps a way to generate the pressure on demand by controlling the chemical reaction? Any ideas?

The idea of course is DIY so "buy a H2 can" is not an answer. :)