Andrew,
If you find someone who claim success with this approach, ask them to prove it and if they can, take note and follow exactly what they did.
Because for myself and some other people, we only get to meet with Mr. Expensive and Mrs. Frustration at the end of this route.
And you only have one chance to fight with ink-clogged head with Epson printers. If you lose, you either pay someone to get a new one and replace it, or toss the printer.
I've done both and I'm done with Epson's bigger printers.
I said 'bigger' because my dinky little Epson R340 still prints beautifully to this day.