On the other hand, even assuming one is too worried about the consequences to fake a TSA marking on the real SSSS boarding pass, usually the gate agent will simply not notice the lack of TSA marking on an SSSS boarding pass.

Therefore, one course of action is to buy another fully-refundable ticket, use the non SSSS boarding pass to pass the checkpoint, and then just hope that the gate agent doesn't notice the lack of TSA marking on your real boarding pass. If the gate agent does see it, you're in no worse position than you were before - you submit to groping and then board. If the gate agent doesn't see it, you and your property have escaped the TSA unmolested. Traveller: 1 TSA: 0