This one is simple
but you will need 2 PC's sharing the ?same? internet connection
PC 1: clean OFP + OFPSentry
PC 2: cheat ready OFP
Both OFPs must use the same user name profile
1. On PC1 connect to the OFPsentry server
OFP will now start up. Just leave the game on the intro screen
2. On PC2 run the cheat OFP and join the desired server
3. When you are finished just shutdown OFP on PC2
then shutdown OFP + Sentry on PC1
Obviously you want PC2 to be your high spec gaming PC
PC1 can be of any spec that is able to run OFP
Kudos to AC for confirming a few things
Happy haxin