Sorry to hear about your injury.
There are so many of these TD4 not starting issues at the moment with subtle difference - like yours chugging away on low revs before dieing.
For it not to start on easy start though is a big alarm bell! When the engine cranks the valves action as normal and it will be sucking the easy start in as fuel - if there's fuel in the cylinders it SHOULD ignite - there's nothing else needed - injectors, ECU etc.
So that points to it not being a fuel or electrical issue - and points to a mechanical issue. Even the low revs makes it sound like the electrics are working and fuel being delivered - but there is a mechanical issue making the engine struggle.
As Nodge said previously, a compression test may be in order - there was an example where bad injectors had basically eaten away at cylinders because of fuel burning incorrectly which I'm sure was TD4.
Stealing Nodge's advice on another issue, its possible the exhaust (cat) is blocked. I'm not sure I've seen an example of a TD4 suffering this on the forum, but there was a V6 that had problems due to a blocked cat. I don't know if you can simply disconnect the exhaust to see if it will fire.
I've never used easy start, so not sure whether you're squirting it into the air filter box or removing the intercooler hose and squirting it in "closer" to the engine - but are there any blockages between where you're squirting it and the engine - eg internal delaminated hoses, blocked intercooler etc.
Are you sure you were using the easy start correctly?