Thanks to everyone for their insights. Sorry couldn't be more responsive but mundane job calls.
I think what we are going to go for is a variation of the Familiar process with the three cords going with the Cord of the Body, the Mind(Intellect), and the Spirit. Definitately considering this to be a major breakthrough to achieve.
In someways, this will be a almost like initiating into a Mystery - there will be be a variety of sacrifices and quests and then combined with good old experminentation and lab work.
Of the the quests devised probably the most important with be the Quest for the Roots of True Love (has to be a more poetic name to this). True love is given as a gift of the creator (Dominion). Theefore, can the magi discover how and why this is done. What is the Emination of love from the creator that shines into the mundane world to create such this effect. Sort of think Plato in the cave with the various aspects of true love shown by the light and shadows on the wall of the cave. Haven't worked out the mechanics of how eros, selfless love, spousal love or filial love from the Dominion works into the project but the players are begining to learn greater amounts of Dominion Lore and seeking those with direct/indirect experience of teh love of God.
Trying in the Greco-Roman tradition of love and relations, the players will be looking for examples and occurences of other true loves over history. Greco-Roman myth does spring readily to mind with partners having true love, lots of one-side love, betrayals and tragedy, not a lot of happily ever afters or love so great will to sacrifice one's self for the other. Anybody think of a True Love in Classical Myth?
Spirit Mastery/Theurgy is dead on. Are there spirits of love? mythic beings with such true love, can the players find out who they are and learn how that bound functions? How does one bind spirits in such a way to allow them to thrive and grow?
The troubadors of Provance have magical insights (have a small ex misc/Jerbitron association in my campaign). Can the courts of love show insight into the meaning of love?
Finally, the players will seek living examples of True Love in Mythic Europe to seek insights into the how that love has developed.
Not a lot of interest in faerie, as the the players believe (and I agree) that faeries are simply reflections of humanity, and not good reflections. But who knows, our Mertina necromancer (he's definately one of a kind) would like to see his lost love brought back and seeksto use faerie associations as a means of resurrecting his lost love.
The next genuine problem will be balancing my Indiana Jones players (the seeker faction pursuing the secrets of the classical and hellenic greece); the lot that wants to wage war against the Saracens and hunt down the Order of Suliman; and the lets figure out how to hold onto (and grow) our nice covenant with vis claims over the Duchy of Cephalonia by mundane and hermetic political maneuevering faction. Good news is we run three story guides in a variety of locations, but I can see the True Love "faction" as probably one of the most interesting themes for this covenant. Just need to see how it weaves together.