You don’t need include third party code, just compiled libraries, headers and integration. NVIDIa shouldn’t have any problem with such integration as they are doing it for years as of now.
The question is how efficient is GI Works. As it also volume based solution.
Precomputed Radiance Transfer.
PRT is actually nice thing. It’s quite useless for closed and small spaces, as you are limited by probe density over map. But for open level it is good technique. You don’t need super accuracy, you just need lighting variance. And that is what PRT provide at very low cost. More over it works with time of day.