Have you looked into dappnode at all? Lot of people use it and they sell boxes https://dappnode.com/en-us
Here’s an (old) article walking through and showing just how “plug and play” it is/was. GUI is a big deal imo, and it may have gotten quite a bit easier since this.
I think it’s close. But not totally there. I’d really rather not have to connect anything to it. I might get one to try though.