We all like to have "our options" with us. It seems you need to become more comfortable with the lock box option.

If you do all the precautions mentioned above, about not having anything visible to interest a thief, park in the most secure place available, and hopefully have a car alarm, then you've done your due diligence.

I would add one other thing, to not draw attention doing a lock box transfer from CC, and complete the transfer to the box before you arrive at the parking destination. So that you quickly exit the vehicle in the parking area without drawing the attention of anyone watching you park. Hiding stuff before you arrive also includes any expensive car electronics like GPS's or radar detectors.

If you feel so attached to your regular carry choice, that you would be devastated losing it, then maybe you need an alternate, like a Hi Point, that would allow you peace of mind leaving it locked in the car.