After he enchant his first item in Spring 1246, would the covenant be interested in Marcellus enchating a number of charged items (copies of the Spear of Roland) as a anti-drake and anti-owlbear defense (or any other wild animal)? Marcellus could spend a season crafting 10 charges (probably in 10 spearheads each with 1 charge), provided he receives suitable compensation for his time.
Based on what is stated in HoH:MC p.114, he should charge 4 pawns of vis (twice what he can extract, with his CrVi lab total being exactly 20 at the moment) for a season enchanting charged items.
This is a short-term bargain, since as soon as he improves his CrVi lab total the price will rise to 6 pawns per season. 