The phrase "a difficult task even" is not correct as it stands and lacks clarity in written English.
It can be used in a context where you want to emphasize that something is a difficult task, possibly in comparison to other tasks, but it needs additional context to be fully effective.
Example: "Completing the project on time was a difficult task even for the most experienced team members."
Alternatives: "a challenging task even" or "a tough task even".
To separate them artificially, as we do now, is to make a difficult task even harder.
Binding carbohydrates from water is a difficult task, even for the natural carbohydrate-binding proteins known as lectins.
Formally making it to the club of states remains a difficult task, even for those, such as Taiwan, that are most prepared for it.
The instrumentalists, and often the singers, must execute lines and harmonies in precisely placed microtonal pitches, a difficult task even for musicians steeped in Mr. Eaton's style.
Elucidating uncertainty and sensitivity structures in environmental models can be a difficult task, even for low-order, single-medium constructs driven by a unique set of site-specific data.
Finding abnormalities in diagnostic images is a difficult task even for expert radiologists because the normal tissue locations largely outnumber those with suspicious signs which may thus be missed or incorrectly interpreted.
But saving the world can be a mighty difficult task, even with a very simple message this time around ("Be kind").
Calling a bottom to the industry's problems is a notoriously difficult task, even for sophisticated investors like Blackstone.
That leaves the government with little choice but to try to tackle them at home, but it will be a long, difficult task, even if foreign allies stump up financial and technical help.
Aspuru-Guzik has pioneered methods for modeling molecules, a notoriously difficult task even with today's best supercomputers, and there's hope that quantum computers will soon be able to turbocharge such simulations.
It is making rapprochement between the world's leading military power and its fastest-rising one a fiendishly difficult task — even as the president of each nation says he wants to achieve precisely that.
