throttle before or after turbo

[Ferman C. Lao]

Would a set up like this work on an NA efi engine?
 Throttle body
 NA MAP sensor
 turbo
 intercooler
 intake runners
port fuel injection
 aftermarket rising rate fuel pressure regulator
Stock ECU
  I've been toying with the idea for quite some time , but havent had the
opportunity to try it out yet.  It seems to me that by putting the NA MAP
sensor between the turbo & TB will enable it to always read vacuum only &
there would be no need to change the MAP sensor or ECU to one that is
capable or accomodating boost readings.  My question is aside from the oil
being sucked out thru the oil seals, are there any other problems ?
And will the vacuum produced in a such a way be out of range of the NA MAP
sensor?  How about the rising rate fuel regulator? Will it operate without
any problems in a setup like this?