Unless you're planning on chopperizing your bike and doing something really radical I wouldn't have thought you'd need to worry too much - all the lines, front and back, have a fair bit of slack in them which should be sufficient for your needs...?
Not really sure Bryce, the standard switch blocks have locater pins in them to get the to line up 'just so' on the standard clip-ons. I would imagine if you're changing to a set of dirt bike bars you could always file the pins off which should allow the standard blocks to fit your new bars. As for the brake lines I guess with the extra height and width you may well need to get some longer lines, but what you're doing has been done before so it can't be impossible...I'd do a little research - different bikes have different length lines and different shaped banjo bolts (different bend angles mostly) which means if you shop around you should be able to find something that'd do the trick for you.
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