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Let's start with the easy part. You cannot use a 10s system with a 9s cassette because the spacing is different. But you can fit 10s cassette on a 9s hub because the overall width is the same.

So replacing the cassette is the obvious solution, and try to sell the one you have to recoup some of the cost. If you prefer to do things the hard way, there are adapters made that change the cable pull at the RD from that at the lever, so you might be able to do a workaround.

As for the brakes, if you want to use the new style straddle link you'll probably need to change the carrier also. Assuming that the brakes take a cable head on one side, and have a pinch bolt on the other you're probably better off sticking to the traditional rig with a universal straddle wire, carrier and main wire. Sheldon Brown published an informative article on setting these up here.

If you're stuck for a yoke wire, you can use a standard brake wire, which is oftentimes the same price despite being more than 10 times longer.
 

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Up until the last few years, frames had down tube lever bosses brazed on and the shift lever sets came with adapters to convert the boss to a fulcrum (cable stop). Eventually frame builders have figured out that nobody's going back to down tube levers, and are brazing fulcrums for the handlebar shift systems (I won't use the B word). Consequently the lever sets no longer include the now obsolete adapters.

Check your frame to see if you need the adapters, and if so, they can be had fairly cheap. (I have a few hunderd pairs of Campy ones).
 
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