The movie slide-strip is silly, if you look at a still image of the scene, the disassembly lever is already down.
Besides, with any semiautomatic, anyone close enough to disassemble your slide can push the slide far enough out of battery to stop the gun from working.
The simplest solution? If someone lunges for your pistol, shoot them.
The 92-series is a wonderful pistol with some legitimate criticisms, most notably the long first trigger pull and the weight/size. The risk of being "field-stripped" is, in my opinion, not a legitimate criticism of the design.
That said, if you're going to have to conceal, the reduced weight of the also-excellent G17 might be nice.
Beretta PX4 Type F Fullsize .40 S&W | Beretta 92FS 9x19 Para | Beretta 8040 Cougar Type G .40 S&W | Rock Island Armory GI 1911 .45 ACP | Sig Sauer P6 9x19 Para | Colt Python 4" .357 Magnum | Colt 1968 Det. Spec. .38 Spc. | Ruger LCP .380 ACP | Daniel Defense M4V1 5.56x45 | Alpine M1 Carbine .30 | Steyr M1895 8x56 | Ruger 10/22 .22LR |1943 Izhevsk Mosin-Nagant M91/30 7.62x54R | Remington 870 12GA