The phrase "serve as alternatives to" is correct and usable in written English.
It can be used when discussing options or substitutes for something else.
Example: "These new products serve as alternatives to the traditional methods we have been using."
Alternatives: "act as substitutes for" or "function as options for".
But other airlines offer flights that can serve as alternatives to the shuttle.
Alkanes of defined carbon chain lengths can serve as alternatives to petroleum-based fuels.
Biomaterials that induce adipogenesis may ultimately serve as alternatives to traditional tissue reconstruction and regeneration techniques.
They serve as alternatives to develop and adapt a relatively simple manufacturing technology compared with an extrusion/spheronisation process.
The developed novel RGD-displaying flagellin variants can be easily obtained by bacterial production and can serve as alternatives to create cell-adhesion-regulating biomimetic coatings.
CLINTON -- Well, I have spoken out for quite some time, even before this race, on my belief that we should have drug courts that would serve as alternatives to the traditional criminal justice system for low-level offenders, for users.
Ionic liquids constitute a group of solvents that can serve as alternative to the commonly used volatile organic solvents.
Given its superior responses, Grade A fertilizer applied at a rate of 2.5 t/ha could serve as alternative to mineral fertilizer.
Several ethnomedicinal plants have been found to possess neurobehavioral profile and serve as alternative to modern medicine.
All this work, in turn, finds ready correlatives in Chelsea galleries, raising the question of whether smaller museums are serving as alternatives to, or mirrors of, the mainstream.
A number of reports describe the detection of antibodies in other types of body fluids which can serve as alternative material to serum [ 8- 11].
