you can buy a bent springer frontend for a lowrider, and then chop a couple of coils out of the spring to lower the front end.
if you want to go with straight chopper style forks, you can find them on e-bay with rake built into the triple trees. (the lower tree is wider than the upper tree, raking the forks out).
the best way to rake a frame of corse, is to cut the head tube off, angle the frame tubes, and weld the head tube back on. but since you can't weld, that's out.
here's my bike, with a bent lowrider springer, with 2 coils cut out of the spring.
yes the more rake you have, the less steering you'll end up with. if you have too much rake, the front end will start to wobble at speed and you'll end up in a "tank slapper" where the front end wobbles out of controle and the bars end up slapping the tank back & forth.
the way my bike is set up, the steering is fine, but i don't know too many people who actually "steer" to go around corners....you just lean like on a motorcycle.
but, my bike was set up with straight line speeds in mind, not cornering.
yes, my bike has pegs on the rear axle, which gives you a lay down riding style, like a drag bike.