"barely accessible" is correct and can be used in written English.
It is usually used to describe a location or an item that is very hard to reach or to acquire. For example, "The entrance to the cave is barely accessible, as it is hidden by thick vegetation."
That hardly mattered when the data were barely accessible, but Princeton was helping disseminate it.
In a barely accessible storage room, evidence of leaking pipes from days gone by.
Or on the barely accessible slopes of the Santa Cruz Mountains?
The Wrights slaved away at their project on a barely accessible bit of land.
This will finance an effort to tap into rich but barely accessible reserves below the ocean off the Brazilian coast.
Food and fuel supplies to the far north, which is ice-bound and barely accessible in winter, have been disrupted.
The resulting sparticle mass spectrum may barely be accessible at high-luminosity LHC while the required light higgsinos should be visible at a linear e+e− collider with higgsino√s>2m.
However despite increasing demand for traceable, more localized and healthier meat, there are chasms in meat production infrastructures that barely support accessible, affordable, safe, fair wage, clean, permitted, size-appropriate humane slaughter and processing facilities that could provide any kind of slaughter-ritual or otherwise.
Now he is barely more accessible than his rival, which is saying something.Back home, one of my African-American neighbours, who is terrified that Mr Obama will be assassinated, asked me if he has any security.
To him, the troubling thing was that the essential data to predict the best cancer treatments already exists in hospitals all around the world, but has barely been made accessible to oncologists.
Mr. Kahn ran ductwork, electrical conduits and lighting tracks above the triangular coffers; they are readily accessible but barely visible because the only way to see them is to look straight up.
