Is there a way to get iTunes to transfer my apps on an offline machine?
You can transfer from iPad to Laptop using Internet and iTunes.

Now use a cross-over Ethernet cable, and transfer from Laptop to PC.

There is no Internet involved here, just the cable.

How to use cross over cable set up.

http://smallbusiness.chron.com/connect-laptop-pc-via-ethernet-cable-56523.html

http://windows.microsoft.com/en-us/windows/connect-two-computers-crossover-cable#1TC=windows-7

All above also works in reverse.

Get the crossover ethernet cable.

http://www.amazon.com/Belkin-CAT5E-Crossover-Cable-feet-Red/dp/B000067RFT