First, if you are looking to do that, then go to www.flatlandfuel.com
and support Pat who will tell you anything you want to know about them. Tell him BMXTRIX sent you his way and he will treat you extra nice.
Those cranks won't work on the Signal, seeing as how they use a Euro bottom bracket. You will want to ask Pat what kind of price BREAK he can give you if you want those cranks, but with an American bottom bracket instead. He may be able to cut you a discount... Dan's probably won't be able to do that for you.
Those are crazy cranks though... I would probably go with Profile Elite Flatland Cranks on flatlandfuel for a hundred bucks less.
Match that up with a RNC TI sprocket if you really want to get crazy.