Spurs go Jingle Jangle, Questions about Cyberspurs and Foci. Options

[-X-]

You can safely skip the first couple paragraphs and just skip to the actual question as the first paragraphs are just background as to why I'm asking.

In 3rd edition I was in a group with a guy who had replacement blades for his spurs. A type for every oocasion, he had Dikote spurs for everyday use, silver plated spurs with gold inlay for when he thought shapeshifters were a potential threat, hollowed plastic spurs for injecting chemicals (Used to surprisingly good effect when filled with insecticides on a fleshform bug spirit) and finally a set of ebony spurs with supposed Orichalcum runes for vampires or spirits (And despite the fact that the character was entirely mundane the GM gave him a tiny bonus when fighting spirits due to effectively boosted willpower from the placebo effect). Now this guy's story was that he'd specifically had a quick release implanted (.1 essence I think) so he could eject a blade onto the floor as a free action then slam home a new one as a simple action (I think, the same as putting a new clip in a gun.)

Currently I'm working up a high adventure campaign where the characters will start off quite powerfully, but won't have too much opportunity for advancement, particularly money-wise, during the campaign. To help boost power levels a bit and to encourage some backstories that will be useful to me as a GM I'm creating some package character creation deals. Usually a series of cyberwear, qualities and skills and background tidbits that if picked up by a character with the right prerequisites cost significantly less than if they'd bought them on their own.

One of the packages (A former Deus Blue Banded Mage) requires the Mystic Adept or Magician quality and includes beta-grade cyberspurs in each hand. The off-hand spur is a power focus and the primary hand is a weapon focus. (The character also has a fingertip replacement spellcasting focus and an unused fingertip compartment for later potential foci use (currently a monowhip))

So here's the questions;

1. How easy do you think it is to remove the blade and tang (Not the whole piece of cyberware, just the knifey part) of a factory standard cyberspur? If one of your spurs breaks do you pretty much have to wait till you can find a doc for surgery?

Or maybe you just twist your arm 'just so' and pull on them when they're only partially extended and out they come easy as pie?

2. Would having cybernetic pieces that actually slide into your body help conceal a focus from assensing if the focus wasn't 'on'?

3. Same as #2 but if the focus is active.

4. Would there be any increased danger of damage to the Magician if someone attacked their focus while it was retracted?

5. Then again would they even be able to attack the focus at all since presumably the magician's aura would be in the way. (or maybe the essence loss of the spur would weaken the aura enough around the arm to still allow an attack? Then again what would happen if you swallowed an active focus?)

Not likely to be a huge issue or anything, it just made me wonder and thought I'd search out more perspectives on it.