At my old job, we actually did this on an industrial scale. We took the LCDs, separated the layers (cover glass, polarizer, LCD), added a touch panel, customize

At my old job, we actually did this on an industrial scale. We took the LCDs, separated the layers (cover glass, polarizer, LCD), added a touch panel, customized glass (maybe hardened or with a logo). Then we glued everything back together with special silicone, so that you had the airgapless look common on phones (optical bonding), but also for larger size screens. It turns out to be cheaper this way, and you can't always buy the plain LCD cell anyway. Our Chinese factory was quite proficient at this, but it is very tricky and you need a lot of practice.