The phrase "a serviceable form" is correct and usable in written English.
It can be used to describe something that is functional or adequate for a particular purpose, even if it may not be perfect or ideal.
Example: "The prototype we created is not perfect, but it serves as a serviceable form for our final design."
Alternatives: "a functional version" or "an adequate form".
Many advocates of a public plan had doubted that it could survive in serviceable form because of the intense opposition from insurers and other major health industry players.
Well finished and clean in appearance with simple decoration, Queen's ware became, by virtue of its durable material and serviceable forms, the standard domestic pottery and enjoyed a worldwide market.
Serviceable forms and familiar motifs are likely to persist, and changes are gradual in comparison to the sudden innovations possible in sophisticated art.
Local gas pipelines provide a valuable resource to urban areas and are often forced to cover unfavourable ground conditions in order to form a serviceable network.
Resources at Arsenal are low, with some players at the African Nations Cup and others injured, but Johan Djourou could form a serviceable if gauche partnership with Philippe Senderos in the middle.
He said: "As there is no indication of problems with the engines, gearbox or flying controls, it appears that a serviceable aircraft crashed due to some form of fuel starvation, despite having 76kg of fuel in its tanks.
In the words of Alan J. Lerner, W. S. Gilbert raised lyric writing "from a serviceable craft to a legitimate popular art form".
Depending on your druthers, they formed a handsome collection or made a serviceable doorstop.
Graphic novels, by the nature of their form, often use as little text as possible; the dialogue is sometimes hardly more than a serviceable vehicle to drive the action.
A serviceable if unexciting sausage.
