First of all Hello everybody, long time no see.
About your concept, there is a maga i made and recently discovered how on the fringe of Frightening Funchkinism it is.
I think is exactly what you want but in a different way.
Lorcan Filli Pralix
Per 3 Pre 0 Int 1 Con 0
Str 0 Sta 3 Dex 0 Qui 0
Virtues
+3(He) Faerie raised magic
+3(Su) Strong faerie blood: Padfoot
+1(He) Independent study
+1(He) Affinity (Rego)
+1(Ge) Improved Characteristics
+1(He) Cautious Sorcerer
House
+0 Comprehend magic
+0 MinFocus Hedge magic
Total +10
Flaws
-3(Su) Lycantrope
-3(He) Waster of vis
-1(Pe) Faerie upbringing
-1(St) Visions
-1(St) M.A.Companion
-1(He) Hedge wizard
Total: -10
House
-0 Weak Magic resistance
The combo is VERY story dependant and VERY playabe thus is easy to control guidewise.
basically is to combine Faerie raised magic HoH:mc with Comprehend magic HoH:S
With faerie raised you can copy and learn Hedge magic you are able to witness, with conprehend magic you can study them, and integrate into hermetic magic.
Rulewise, throug copiing a spell you witness and put it into a lab text ( 2 seasons min.) you ad as many breaktrough points as magnitude of the spell.
Finding a "friendly" bonisagus you may end with a minor breakthroug in 2 seasons, a major breaktrough in 4 years and an hermetic integration in less than 10 years. this without pushing the limits , minimaxing or using multi asistant low level low risk experimentation. that can end you in integrating guaranach, elementalist and folk witch magic in roughly 30 years.
so your profeticed magus could easily fulfill the profecy before age of 70. having played many many adventures.
a character worth beeing played, a nice story very saga dependant.
EDIT:
wow i've been thinking....
you may take a major virtue Death profecy Arm5 41 and a major flaw Dark secret ( scryer)
death profecy -You shall integrate all the exmiscellanea traditions in hermetic magic thus you will die the day you fulfill your destiny.
if you do so, surely you will be marched by your own house...