My way would be to pseudo-initiate the virtue, through entirely mundane means.
For example: Initiate Good Teacher, minor virtue known by "Mystagogue". Use "Teaching" as "Lore" and "Communication" as "Presence"
Script bonus: + 9, target +15; The character must have at least Teaching 3 and Scribe 2 to initiate this virtue.
The character travels to a Great University of Mythic Europe, before the begining of the Michealmas term (+1) The character must find an instructor who will help develop his teaching skills, and pay a substantial amount for the instruction time (+1). The Mystagogue must spend at least one season teaching the art of instruction (+3), after which the initiate must spend a season practicing by tutoring students (+1). In the process, the initiate becomes taken with his own prowess as an instructor and the resepect his students pay him, on the basis of his teaching, rather than what he knows, gaining the minor flaw Overconfident (+3)
The SG and the player agree on a reasonable degree of "initiation" to gain a virtue.
A character might likewise "initiate" "Improved Characteristics" with a new ordeal "annual comitment", representing a commitment in time every year to keep up the virtue (+3-+6 dependin on commitment in time for exercise, for example, to keep up points in strength and stamina.)