Yes, Sahajiya Vaishnavites are vamachari Vaishnavites, they are not a part of Gaudiya Vaishnavites. According to this Sampradaya's philosophy Radha is supreme than Krishna, she is mula prakriti. They were Advaitans, according to them the supreme nature of the creation is void. Some of the Bauls are vamachari. Most of the Bauls are dakshinachari.
Temple and idol worship appears to be a post-Vedic development according to several scholars.
Swami Harshananda (Ramakrishna Math) says the following in All About Hindu Temples:
A Brief History of Hindu Temples
How and when the first temple took its birth is anybody's guess. Temples do not seem to have existed during the Vedic age. The practice of preparing ...