So, this is, of course, very illegal. That's unlikely to stop a Tytalus, but should be noted.
The thing about doing crimes in the order is that you can get a way with a lot if you're popular, powerful or people are apathetic to your crimes. Other magi can decide to just not hold you to a crime if they don't feel like it.
However, creating some wiggle room in legality will always help- even a very powerful and connected magus will find it hard to get away with a really blatant violation of the code. People tend to dislike that, since the code is designed to stop things from becoming problems for all hermetic magi.
Being a Tytalus, they might lay some groundwork by arguing for the most permissive possible interpretation of the "Mundane Interference" clause of the code that they possibly can, whenever they can. Be at every tribunal meeting, speak in favor of every time it happens- hell, arrange sympathetic cases if you can.
While doing this, try to make friends with other magi and arrange for them to be placed in useful positions- many tribunals have problems insuring that all magi show up to meetings, so if you know and are friends with the magi of each covenant who tend to show up then you have a tremendous advantage.
You are going to want to destroy the power of the houses Tremere and Guernicus in the tribunal- those two will always push for the strongest enforcement of the code on people in house Tytalus and generally oppose things that make big waves.
If you manage to pull all of this off, namely:
- You have eroded strict interpretations of Mundane Interference to the point that it will be hard to really justify stopping you from doing more overt things.
- You have successfully become popular, connected or (through blackmail, certaman or murder) removed those active magi who would oppose your actions.
- You have removed several powerful or active members of the houses that like law and order.
Then that doesn't assure you'll get to do what you want, but it makes it more likely to work. You should also strive to get some appearance of support from things that the order doesn't like to upset, like the Church or God (or powerful magical spirits or faeries). Your goal is to make opposing you seem difficult, annoying or counterproductive, while making your advancement seem harmless or beneficial to the order.
Oh, you could also try to arrange for the current king to be really dangerous or hostile to the order, or some industry the order relies on. Otherwise, interfering with them in some way that makes them seem unstable or cursed can help bolster good will from other magi- no one likes political instability where they live. Between 1223 and 1226, two French kings will die, ultimately leaving a twelve year old as the king of France. You should exploit that before he manages to become a very popular and pious king. Later in life, he sometimes punished blasphemers by mutilating their tongues or lips. If that happens to a Magus, this could inspire a lot of fear and anger in the Order.
Ultimately, your biggest problem is going to be other Magi. Mundane authorities are going to bend quite easily beneath your magic, despite their best efforts. Capture the support of religious authorities with political means and the support of the common people by miraculously solving their problems with discrete magic (or just rule as a wizard-king who can casually heal the sick or banish ghosts and demons). Other Magi are your rare equals in power, and convincing them to not stop you is your most difficult goal.