I was getting ready to put my order in for some candy after digging through some French bicycle literature, only to be slightly disappointed that someone already crossed the finish line. Haha.
My track coach in high school used to say "if you're not first, you're last! We ain't giving out...
I would STOP and not force anything on the seat. If you want to ride the bike, buy a reproduction saddle and undercarriage. Then, I would put your original saddle back together and put it in a safe place on a shelf.
My Orient men's bike doesn't have model number on badge, and it doesn't look like it has been changed. NICE project Jesse. Looking forward to the build! (I know the seat is not correct, but it was a good place to store it)