That is one nasty scratch, back in the day when I was a disc jocky at a radio station we use to put quarters on the tone arm, looks like you tried that, you might find a replacement disc at a vintage record shop, a lot of record collectors are not after the disc anyway, they want the cover art. I heard of some computer software that might help too
I think the cool factor could still be there if you bought a replacement vinyl, because as has been pointed out, a lot of people are more interested in the jackets and artwork, and that's probably what anybody in your family spent the most time looking at and handling.
While I miss a bunch of old stuff that never got reissued on CD & .mp3, I'm glad at never having to make myself crazy buying needle cartridges or being anal retentive about handling and preserving vinyl.
Yard sales...flea markets...even radio stations getting rid of unwanted vinyl...most of the time for little to nothing..used yard sale record worth about a buck. problem with radio station copies is that back in the day we use to back cue the records so there will be cue burn on the first few seconds of the cut...yard sale and flea market finds may have bad scratches but for a buck it is worth trying