Customer keyboard people will sometimes buy outrageously priced aviation connector cables. The ends though are cheap and work well. A custom connection would not be too hard to make so that the actual USB plug isn't where force is being applied.

I've done the hack version and just super glued the start of a cable coming from a keyboard to a case so that the actual connection wasn't stressed.

It might be better if they made it easier but it is a problem that can be solved.