The phrase "accessible only as" is correct and usable in written English.
It can be used to indicate that something can be reached or utilized in a specific manner or format.
Example: "The document is accessible only as a PDF file, so please ensure you have the necessary software to view it."
Alternatives: "available solely as" or "obtainable exclusively in".
It could even make formula a prescription-only product, making formula accessible only as a food of last resort.
In the past, print articles that were available online exclusively to subscribers were accessible only as clunky PDFs.
At country-level detailed estimates are published for UK, China and USA, and data on other countries are accessible only as aggregate partial representation via web-based tools.
Google Earth, which shows 3-dimensional satellite imagery, is now incorporated into the online version of Google Maps, instead of being accessible only as an app to download.
But as his crude technology, which relied on exposures for each color, fell into disuse in the last century, the photographs were accessible only as black-and-white prints or as negatives of the individual color separations.
Add to that the studio's sparkling wit, manifested in gags or allusions often accessible only to older viewers, as well as a wealth of incidental detail that positively demands repeated study, and it's no wonder that Pixar's movies can withstand tens, even hundreds, of viewings by any age group.
We found that providing space for each startup, accessible only to them, is as important as providing shared space that includes conference rooms, open plan classrooms, printing and computer facilities, and larger auditorium style spaces.
Another dozen or so people use the place as a fishing camp it's accessible only by boat and as one unfortunate BassMasters Classic participant found out, the canal's strict speed limits are enforced by shotgun.
What remains of Tanjungsari is now accessible only by motorbike, as the roads are blocked by huge boulders and 1.5-metres of mud.
"Most other reproductive biotechnologies, like IVF, were initially accessible only to wealthy clients but as the technology improved became affordable for many more citizens".
In "Difficult Choices for the Old Rec Center" (news article, July 9), it was disappointing to read your dismissal of the Y.M.C.A. as accessible only to those who can afford to pay its fees.
