If it were me...and it's not...I would skip the k...and buy/ fabricate a 2x4 or 2x3 front clip with the narrower frame rails/suspension for the air bag...if your going to narrow it
Thats why I'm mocking up. If I can save 30+ hours of fab time by running a factory style k-member from you I wanna do it. Maybe notch the rails a bit for turning clearance only.