OK, so, does anyone have ideas for the sort of weapons that a version of Shirou from the 2030s could realistically be using? He has Yakuza contacts, so any weapon they could realistically get hold of he can get, and he also has the ability to use reinforcement to improve the performance of items which means that something that is usually of limited use can be made more widely applicable.
For example, I've got him having an invisibility cloak, which is as a concept viable (we can already make them for microwaves) but which is likely to be difficult to extend to hiding a human being, particularly a moving one. But, using reinforcement he can make the meta-materials in the cloak do their "job" better and, thus, give him the ability to hide himself even when moving. But, I'm struggling to think of other futuristic weapons or tools he could make use of.
Remember that this Shirou is not a full-time monster hunter like MoS Shirou is, he doesn't really go looking for trouble. But, nevertheless, he appreciates the fact that Sakura is a juicy target for a lot of unscrupulous magi, and he also assists Rin and Sakura in protecting Fuyuki, so he makes sure he's well-prepared for when he does need to fight.
When he fights, goals are in order of priority:
1. Protect his family.
2. Protect innocents.
3. Protect himself.
4. Deal with the incident with as little loss of life as possible, including the target unless the target is someone who simply cannot be allowed to live. Note, however, that Shirou is not particularly interested in enforcing the law, either magical or mundane. He considers it just as legitimate for a person to die by his blade as he does for them to be executed by the government or the Association. So, he'll happily let someone who was brainwashed or similar escape even if legally they would be charged with murder, and would even actively assist them in some cases.
Note that this implies that non-lethal weapons are handy, but certainly not essential. The life of the person he's fighting comes below that of anyone else, although he'd try to spare them if at all possible, especially if they're not really to blame for what is happening.