I think the supercharger would be a great way to boost both the appearance and performance of a 53, but since Kaiser didn't put a supercharger in their cars until 54, it wouldn't be a clone so I wouldn't worry about trying to make it 100% OE, I would go through and put a little 21 century know-how in it, tastfully hidden, of course.
With that said I do have a few unconventional ideas that might solve some problems...
1. As far as the fuel pump is concerned, I bet you could mount an inline electric pump/filter along with some careful application of paint you could get it to look like a fuel filter and I'd bet it would fool 85% of the people out there.
2. I'd bet you could route some exhaust tubing from the supercharger inlet to a spot in front of the radiator, (maybe even behind the headlights) that you could mount your K&N too and get some nice cold air to the supercharger, And if you picked up couplers that looked period correct and painted everything, you could fool quite a few people.
3. If you plan on rebuilding the motor, I bet you could put some hardened seats and valves in that would make the motor handle boost better.
Good luck with whatever you decide.
-Matt