I agree - it's not cheap... but then a good phono pre isn't cheap either....
There are more economical ways to do it, there are other software alternatives.... but I don't think I have seen a "turnkey" solution at a reasonable price.
You need a really good ADC... every bit of dynamic range you can get is important.... and they don't come cheap either.
My Mytek ADC cost me circa $1000 about 10 years ago ... and then there is software.
Yes RME is expensive, but it isn't unreasonable for what you get.
In theory, the necessary functionality could be rolled into the Parks Audio Puffin phono stage.... which at around $500 could be a bargain.... but it ain't there... It has the EQ capabilities, but no analysis capability linked to it...
Perhaps if enough people ask for such a feature?