I want to serve my beer from on of these:

Here's the idea:
Connect a polypin to a primary fermenter and colllect the co2. Rack into the jerrycan with gelatine and allow to clear and condition. When the beer is ready, connect the polypin of CO2 to the jerrycan and drink beer. When beer is drawn off, co2 is sucked into the jerrycan from the polypin keeping that all important protective layer of CO2 above the beer.
Obviously I won't be able to carb the beer, but that suits me as I don't like fizz. I'd also consider hooking it up to a beer engine.
So... will this work? Will I be able to collect enough CO2 from primary to feed it back into the jerrycan? I have a few polypins so am not limited in that respect.
Have heard of this being done before... just not sure where!
Cheers
