Installing NVIDIA driver with Intel HD Graphics

Installing NVIDIA driver with Intel HD Graphics

I have an HP laptop with both a Geforce GT 740M and the integrated HD
4600. The computer automatically switches between the two based on usage
in order to save power: it uses the integrated for most things, then
switches to the 740M when gaming or doing graphics-intensive tasks.
The new driver for the NVIDIA card came out, and I was prompted via
Geforce Experience if I wanted to update. I attempted to install it, but
it won't install because there is no "compatible graphics hardware." This
was obviously because HP only allows special switchable graphics drivers
and I couldn't install just the 740M driver.
I would like to still have this power-saving switching feature, but would
also like the new discrete card driver, since it promises immense
performance improvements. Is there any way I can install the NVIDIA driver
while still being able to use the integrated ones and switch between the
two cards as I do now?
I know HP will never get around to updating their special drivers, so is
there any way I could replace the existing NVIDIA driver with the new one
WITHOUT comprising the switching ability or disabling the integrated
graphics? Something along the lines of extracting HP's driver, replacing
the NVIDIA part of it with the new files, and then installing?
I'm not sure if I'm being totally clear, but I hope someone has ideas on
how to do this. To repeat, I want to install the new NVIDIA graphics
without removing the ability to use the integrated graphics and switch
between the two automatically as I do now.
EDIT: I'm running Windows 8 64-bit.