JD 227 is the hood on the John Deere steel or plastic.? Here is what I do and also did on my Kubota's.
1: make sure the dust is brushed/blown off lightly from the hood
2: Place an old soft towel on the hood, right by the filler cap/cover.
3: Lift up the Blitz equipped safety nozzle 5 gallon diesel can onto the hood on its face with nozzle pointing in the middle of the filler neck..with the Kubota's since the neck protudes up thru the hood, rest the neck protrusion catch on the edge of the tank's neck.
4: Release the safety mechanism and hold the lever sqeezed with one hand.
This is not a big deal and you do not have to hold any can for more than a couple of seconds to lift it up to the hood.. Of course you hood probably needs to be made of good steel, to not dent or crack. I have never had any trouble with 2 Kubota's and 1 Kioti. The old soft towel prevents any scratches on the hood. The new Blitz filler is better than the old flexible neck cans because you would spill diesel all over the hood with this method, but no diesel comes out until you release the safety and press the lever. Life is good.
James K0UA
Looks like your idea would work well on his John Deere if he had or made a large hole shortneck funnel to stick through the fuel hatch into the tank. He could even use his padded tipper plate on top of the hood to hold the can.