Couldn't you achieve the same result in a better fashion by putting a pre-suspension (smaller axle to crown) fork on a suspension-corrected frame?
yes.
You could also just measure your axle to crown on whatever you have and seek a fork that is shorter. You only need about 10mm shorter fork to steepen the angles by about half a degree as a very rough estimate.
__________________
1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear