You would need a new Germanium lens and it would need to be set at the proper focal distance from the sensor. I am guessing ...a new coated lens will only cost you a $1500-2000.
The afocal 3x magnifier for the 1x IR Patrol is only $2500, so my estimate on the raw lens seems plausible.
Of course, you will need a housing if you are getting a larger lens. Never mind the voided warranty.
And once you have spent that kind of money you could have purchased a Trijicon.