There is no such animal. Either you have Scriptural baptism or you do not have. Whether you listen to John the Baptist, Jesus the Christ or the Called-out Disciples, the message is always that baptism is only for repentant sinners who have received Christ as their Savior. John did baptize in the wilderness, and preach the baptism of repentance for the remission of sins. Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Believers are the only fit candidates.
Simon the sorcerer said he was a Believer but his actions quickly revealed otherwise and his baptism was of no effect. Upon receiving Christ they were Scripturally baptized. Without exception, baptism was only administered upon those that had repented of their sin and received Christ as their Savior. Mode deals with the method of Scriptural baptism. Surely if there was more than one way for baptism to be administered the Word of God would have revealed it to us in the Scriptures.