Nice presentation of the facts.
To answer your question, it's a project gun to me.
Not everyone likes to reload for low pressure shotguns, but it's not that big a deal, and OTC shells are available for hunting. So, it you make it go, it can be useable.
Lots of field grade Flues models are missing chunks from the top of the stock.
A decent semi-inletted stock is about 50$ plus your refinishing time to fit , sand, and finish.
The dent is accessable and repairable.
Screws are common.
Why it doesn't fire is the pig in the poke.
It looks well used, with the top lever showing some system wear.
I'd have it stripped and cleaned, and find out what's worn, and why it doesn't fire. After that, I'd buy a replacement stock, and go hunting this fall with a family heirloom.
Using RST's of course.
This is just my opinion of course, it's not laying on my bench. but I like Fluesies.
Should you decide to dump it pm me. I can use another.
God knows why.
