BewBagMan, Thinking more about your notion of CO2 to help the beer along its way to the beer engine. “helping hand to reach the glass”. I wonder if a setup like this might work for beer that would be close to real ale, even though it might not meet the CAMRA specifications.
If the keg and CO2 tank were in the basement/cellar, and the beer engine was on the main floor, then the shutoff valve might not be required, since the pressure of CO2 could be adjusted to be sufficiently low that there was enough to replace beer drawn out of the keg by the beer engine, but not enough pressure to push the beer to the floor above and cause the beer engine to continually drain beer.
Whatever happens, now you have a keg, you’re going to have to splash out on a CO2 tank and regulator, and then another keg (or two), but you are approaching it wisely by doing it piecemeal and explaining it step by step to your wife. I sped the process up with my wife and did it all in one day, including a freezer and a temperature controller to put the kegs in. But! I had two things in my favour…1) it was my birthday and I took back an expensive sweater that was the wrong size, so I had some money there (I pretended of course that I was upset about the sleeves being a bit short on the sweater, but secretly I was gleefully thinking about the possibility of kegs) 2) she is really keen on the beer I make and the lady in the brew shop said with kegs you have no idea how much beer is being consumed as there are no empty bottles for evidence.

The lady at the brew shop did such a good job of demonstrating the advantages of kegs to my wife also. It might be a good idea to take your wife to the brew shop next time and then involve her in the decision. Let the professionals do the selling and explaining. A defenceless brewing husband attempting such a feat single handed doesn’t stand much of a chance.
Ps. You don’t seem to have any kangaroos and gum trees in your yard. I thought you were in Australia.
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