S class is a short list. From canon, the slaughterhouse nine, ash beast, the three blasphemies, the dreamer, the end bringers (thanks to Eidolon), and Scion.
Plus, some of the BS from the SM is actually worse than hypnosis from Nasu-verse which is generally self focused, but could be a Stranger effect. Possession is probably the closest for a Master effect Shirou has dealt with. For internal security there is no better prep than "a monster just...
That poor Inquisitor. Six months chasing one person only to have him literally flown away by the planetary governor in a penal legion destined for Armageddon. Literally two days before he found him.
Oh right, she did dodge Gae Bulg thrown by Cu Chulainn. Otherwise known as dodging a conceptual heart seeking spear used by only two people, Irish Hercules, and his mentor.
[x] ConfusedCanadian
Accounts for actual skill, shows off our wife being awesome, and lets us demonstrate the difference between Guardian and Saber with us figuring out defensive methods, and Arturia being proactive as her usual preferred method.
There is one possible option. Depending entirely on how many parts we want him in. Caladbolg II without breaking it is still a terrifying lethal bullet speed arrow.
[X] - Defend. Defensive Noble Phantasms are currently out of your reach, but you can layer enough mundane shields between Prime Minister Thatcher and any attack to keep her safe.
-[X] Place yourself between the door and the prime minister on top of that, to shield her from bullets, and use...
[x] - Approach the owner in costume with a request that he build some exercise machines to your specifications.
[x] - Purchase the Run-Down Townhouse, accepting the warts for the increased living space.
Welcome back Speaker.
[X] Don your armor!
-[X] Armor up, then peek inside.
--[X] Depending on if it's an attack or someone trying out "odd" abilities should decide any further action.
---[X] If it is an attack, disable the attacker as quickly as possible with the help of Arturia.
---[X] If it's not an attack pull...
[X] plan: I’ll think of one now
-[X] - Innovative Cuisine. Now that you’ve got access to the proper grade and scope of ingredients, you can turn your attention to the fine details of tweaking the Ritz’s current recipes. As they are, they’re solid, but uninspired. Of such fine details are the...