First of all the Puffin does a lot more than you can apparently fathom. It has always had a line input setting with no EQ. Add SPDIF out for a few $$ and you have ADC, DAC or both. Any analog in, digital out.
Vinyl records have been proven to have information well above 20khz unlike CD’s
Isn’t that special. Not news to me as you seem to think. I’d be amazed to see any proof that you can perceive that there info. LPs are NOT proven have any " useful info" above 48kHz.
For bare ones digitalization my JVC CD recorder does a fine job for Redbook. Write to RW and rip to files. Did many original cassettes when I had a cassette deck in the HiFi. Now it goes direct to the PC.