The extra coverage for accessories will help but will not add $3500 to the value. I can’t see any way that it won’t total. Most ins adjusters don’t have estimating systems that have any database for motorcycles so they just have you get an estimate from shop of your choice & they will pay off of that. That estimate cost will be enuff to total it so the estimate is a mute point. So you need to provide all receipts not only for accessories n upgrades, but also your recent “tranny job” (sorry)
All these things wil add to the actual value they settle on. Once totaled, they HAVE to allow you to retain the bike or salvage. It’s your choice. But when you retain it, instead of paying you that value amount, they just deduct the salvage value off of that. So you keep the difference $$$ n the bike