I think what you really need is a program on your computer. Such as Audacity. You feed the output from your new preamp into the computer, and this program makes a digital file out of it, same as any digital music file, to be played back on any digital device.
You can then play the file from the computer, through your DAC into your stereo. I found this article explaining it quite well.
https://www.digitaltrends.com/home-t...yl-to-digital/
No need to re invent the wheel, folks have been digitizing vinyl for many years now. I understand Pro-Ject also makes an external preamp with USB, I’m not sure how it compares to the one you’ve bought, but probably similar? Good luck with it! Let us know how it goes?
Russell