Oh yeah. I've not gotten to Our World yet, and I'd forgotten about those sleeve-things. So, there's definitely a precedence for such things. Cool.
On the Spellbreaker front, I'm thinking of something that's a fine golden chain about a foot or two long and going with Fred's ideas of: swung with Weapons to defend against Evocation attacks (stunt: new trapping, -1) at +2 (stunt: -1) and dissipates what gets through a bit with Armor:2 (-2). It can be worn around a wrist (or maybe waist if longer) and is more concealable than a sword so it gets a +1 discount for a total of 3 refresh. If Armor:2 seems too much, knock it down by one.
I only started pondering this when I thought of a Thaumaturgy-only 'sorcerer' character while reading too much Brust, who calls his magic Witchcraft and calls himself a witch. He has a high concept of "Neighbourhood Witch" (as a play on neighbourhood watch, as he tasks himself to defend an area of the city against supernatural threats) and one of his aspects is Faux Wiccan, because he really isn't one.