Absolutely you can make ghee with cultured butter. Same as usual - heat till melted by any method, then pour off the ghee (I usually strain this, too, since I really need to avoid the milk solids).
Your continued loss is fantastic! And much faster than mine, lol.
5'4" 39yo mother to five sweeties & married to their AMAZING DaddyGrok
Current Weight: 175lb__________________________________Goal: 135lb
Deadlift: 240lb________________________________________Back Squat: 165lb
Bench: 130lb__________________________________________Pre ss: 85lb
***Winning a 20-year war against binge eating disorder***