That's really too bad, but unfortunately, the ink probably won't come out. It may dissolve, but also spread, if you use hairspray. You can also use 70% alcohol, but again, that much ink is pretty much a lost cause.
I would clean it well, apply extra conditioner to the British Tan trim and strap, and forget the ink marks. I'd remove that duck fob's leather hanger, restore it to flat shape (wash, dry pressed under a heavy book) and attach it properly. Someone will buy it who doesn't care about the ink. (The strap and fob are probably worth almost as much as the whole bag. I see them all the time on eBay.)