The phrase "accessible mostly" is correct and usable in written English.
It can be used to indicate that something is primarily or mainly accessible, but not exclusively so.
Example: "The website is accessible mostly to users with disabilities, ensuring that everyone can navigate it easily."
Alternatives: "primarily accessible" or "mainly accessible".
Hitherto these were accessible mostly to very rich individuals and institutions.
North of Anchorage and Fairbanks, for example, with the exception of dogsleds, terrain is accessible mostly by aircraft, Mr. Lagasse said.
Liberty State Park has stunning views of the Manhattan skyline and Statue of Liberty, but the area is accessible mostly by light rail and ferry.
As private chef services grow in many parts of the world, tapping into a luxury long accessible mostly to the elite is becoming easier, and in some cases, more affordable.
Only aggregated geoinformation about malnutrition prevalence is freely accessible, mostly displayed via web map visualizations or downloadable map images.
In the meanwhile, data on post-Chernobyl health detriment in the former Soviet Union and exposed parts of Europe, including evidence of association with such contamination, are already accessible, mostly electronically.
"And the spotlight has been on new authors with more accessible books, mostly about Berlin.
Beyond the showpiece dresses is an accessible collection mostly priced under £100.
Therefore, regional parks are most accessible for mostly all social status levels compared to other park categories.
Besides, the recommendations in the guidelines are clearly described, easily accessible and mostly deal with frequently occurring complaints.
Since 1997, the complete genome of E. coli is accessible and mostly annotated; however, nearly 10%% of its genes with their potentially encoded proteins are still unidentified (Blattner et al. 1997; Riley et al. 2006; Feist et al. 2007).
