> This will involve designing and selling locks and pointing viewers towards better locks in a commercial way.
Designing and selling his own locks on his own store would not be too different from his current business model of selling lockpicking tools.
Pointing viewers towards better locks on a commercial way is something I cannot ever see him doing. For one, he already points out there are some locks he cannot pick (IIRC some Abloy models). But especially: LPLs authority is directly derived from the fact he's impartial and unmotivated by financial decisions. Taking money for lock recommendations would completely compromise that impartiality. It's similar to amateur nude models on Reddit and the "OnlyFans hate" - in the eyes of many viewers, once the line between "they are doing what they do for fun" and "they are in it only for the money" blurs, the attractivity fades.
What I do can see LPL do in the future - with far better chances of profit for him - is sell consultancy services and reviews to lockmakers. That would both fit his goal of improving the lockmacking business as a whole and net him a hefty chunk of money, without compromising his outward image.