[Alley_Kat]

Since mine is my daily driver (not so much now) I keep my tank bag and saddlebags on.
No isues on storage.

[Zepp]

I also keep a spare one (clear) in my tank bag. Mine on my helmet is tinted blue chrome which allows me to see perfect at night with it on. So I never have to change it.

[The CyberPoet]

Jax makes & sells (or at least used to) awesome microfiber visor covers so they won't get scratched in transport -- send him a PM.
Depending on how flexible your visor (shield) is, you may be able to tuck it into the rear side fairings on the 98+ -- one brand I've used was flexible enough to do it, but many aren't.

I don't know how the law is written in the UK on the subject, but here I use a titanium-coated shield on my daytime helmet and carry yellow shooting glasses under the seat (well did til those $%#$% stole the bike); when it got dark outside before I got back, I'd open the visor and just wear the glasses. If I knew I was going out at night, I'd do the reverse -- take a clear shield and a set of tinted sunglasses.

Cheers,
=-= The CyberPoet

[thetable]

I have actually gone to running the Moto-Optix polarized lens. It is a fairly thin lens that velcros on top of the helmets normal shield, and is thin enough that you can store it damn near anywhere.