I'm going to echo what a few other people have said so far and suggest that at least a few of the white accent keys find their way into the base kit.
Other than that, I'm also going to suggest that you exchange the ISO-UK-specific keys for more basic ISO support: ISO Enter, 1.25u Shift, R3 \|, R4 <>. This will make a room for a few other, potentially more commonly used keys in base — such as the white accents, or R3 PgUp and R4 PgDn.
It's also more thematically appropriate, since I don't recall many people in Switzerland using UK layouts (coincidentally, Swiss layouts do use R4 <> keys).