There's a "Metal" element in Street Magic. I actually think you can get pretty decent mileage out of it, although it is in some ways a sucky element (not very good at damaging vehicles, because it works like flechettes), I think it's the best of the ways to fit your concept.
One good way to roll as a MysAd is to melee people, and use [Element] Aura to attach extra damage to your weapon and convert it to elemental. Metal Aura, Metal Wall (which is quite good as it's solid and opaque), and make the "throwing spikes" thing Metal Cloud (WAR!), which is a Suppressive Fire spell. All those are manipulation and are pretty good, and synergize better with melee, and could be described as TK metal splinters. Fling is actually kinda bad.
Spirits are very good and you really should use them. I can see a few ways to fit the theme:
Either Earth or Guardian Materialization spirits could be described as "cloud of metal splinters" easily enough. Guardian spirits can, with GM permission, get Elemental Attack (Metal)*
Possess stuff that's not you - like Homonculi. They are effective, animating a homonculus makes perfect sense as something a telekinetic could do, and they're not really imbalancing (homonculi are a bit better than materialized spirits, but they are 'locked' in place and can't just appear through walls and stuff).
*This isn't better than a more typical element so there's no reason for the GM to complain about it, IMO.