I bought my 99IS with a salvage title. Rode it for four years and then had an accident of my own.
They wrote it off and let me purchase it back.
I rebuilt it, re-certified it and it is back on the road now.
Don't let them pay you that pittance. Insist on having them show you a replacement at that price.
A proper replacement would cost at least $7,000 off eBay.
Tell them if they can get a bike at that price to go ahead and get it, and send it over.
Same colour, similar milage etc.
Insurance companies don't want to spend a dime more than necessary.
Remind them that you were not about to take it to a dealer and ask for cash.
I had a similar event with a car 20 years ago. When I pushed back they gave me a couple grand more.
Good luck.
Don't take no for an answer. Let them know lawyers cost way more than settling this properly.

Best regards,
Glenn