The phrase "solely designed" is correct and usable in written English.
You can use it to describe something that has been created with a specific purpose in mind, or to emphasize the single-mindedness with which something has been created. For example, "This device was solely designed to increase efficiency in the workplace."
The ban on liquor at parties was solely designed to "address binge drinking", she said.
The system's next feature may be one solely designed for visitors who are not experts.
That, on the face of it, is the kind of idea solely designed to set off a conniption.
The access to frontline action was not solely designed by the Pentagon to snuff out censorship complaints that colored coverage in 1991.
It's the relentless tinkering I object to: change for change's sake, those minor improvements and cosmetic adjustments which are solely designed to separate the punters from yet more of their money.
However, this thorough study clearly showed a cull would not work, so … it's being discarded in favour of ill-thought, rushed pilot culls solely designed to placate the powerful farmers' unions.
According to Rand Miller, the brothers spent months solely designing the look and puzzles of the Ages, which were influenced by earlier whimsical "worlds" made for children.
A flourishing net styler doesn't solely design the websites for his or her purchasers, they produce business solutions for them further.
The Cooper Hewitt was the first and for many years the only American museum dedicated solely to design.
The eco-town initiative was exciting but it seemed to focus solely on designing radical schemes in order to meet the zero-carbon standard.
Due to their structural complexity, the functional dissection of sRNAs solely by designing and assaying mutants can be challenging.
