hi i had gone through your query and understand your concerns.
constitutional similimum definitely gives you cure for writers cramps within shot period of time along with management.
1.correct your writing technique. because a faulty writing technique may be the causative factor in your condition.
2. minimize your excessive muscular or motor activity also help for you.
i see similar cases among people esp in male young persons who visited my clinic for this condition and gives 100% cure in all patients.
Usually in such cases I will give treatment for my patients in the following manner RUTA 30 bd/2 weeks and MAG
PHOS 6X TID/month gets good results.
i advise you consult your local local homeopathic physician for correct diagnosis of the case and remedy to fit your complaints on the basis of causation,location,sensation,modality and concomitant. or mail me at firstname.lastname@example.org
wishing you good health.