Entry: 3rd century B.C. works like manimekhala referred to understand buddhist teachings and its spread.Pallibanaperumal accepts buddhism;kiliroor temple and nilamperoor temple.All have become devi temples today.(kodungallor also)
Vikramaditya varaguna(885-925) land grants to sreemoolavasam noted.
It gets interesting here:
"In ancient kerala,the hindu kings extended amiable hospitality and protection to the buddhist temples.By the time of 8th century A.D, buddhism came under strong opposition to shankara and his likes.It tried to hold on but disappeared by 12th century A.D.But the Buddhist traces in kerala society is indisputable. >In reality,Budhism, along with its associated festivities and traditions were absorbed into the fold of hinduism.<
This historian makes a stronger contention that Sabarimala has buddhist connections.
Then goes on to point out the various contributions of budhism in ancient kerala society, especially in the field of education and medicine.