It seems that you've got everything figured out, and are comfortable in your perception of how an attack on your person will always play out...so no further reply from me needed."Many cross draw holsters actually make it easier for an assailant to grab your gun than for you to grab it."
In what way and what type of cross draw are you referring to? It's not easier for 'an assailant' to grab a pistol that can only be drawn in a forward movement. I use a relatively inexpensive KYDEX holster with only the grip of the formed polymer as retention BUT there's only one way the pistol comes out and that direction in right in front of my body. A 'gun grabber' is going to have to defeat both my hands/elbows to reach the pistol. In fact, my left hand/arm will be dealing with this action while my right hand is deploying the knife from my right front pocket.
A moderate sized pistol carried cross draw in front of the weakside hip is relatively discreet and easily defendable.
Good luck in your endeavors.
DGW