A completely analog laser scanning solution is entirely practical. There's no reason to sample it digitally.

But honestly, this seems like insane overkill. Vinyl has a ridiculously limited dynamic range, and digital recording at 24/48 is practically transparent even with low-end prosumer equipment. At the high end you have to work quite hard to spend more than $4k on a spectacularly clean and neutral studio-grade ADC/DAC. (You can spend more on madly expensive super-fi, but it's not going to sound any cleaner than a good Burl, Lynx, or Metric box.)

So if you spend $4000 on the turntable/arm/pickup another $4000 on studio grade converters, you can capture recordings that will be absolutely indistinguishable from the vinyl source. And your precious plastic disks can stay in their wrappers.