Really? You’re going to pay for a car upfront with not ETA on delivery all just to secure a tax credit? Fisker is cash strapped and desperate for money hence them asking reservation holders for non refundable deposits. You want to take that risk for them to never make it to production then by all means go ahead and do it but you’ll lose a lot more than $7500 if they go under before actually delivering.
If they don’t provide a VIN at the time of order confirmation then good luck getting financing from a bank also. I would be very, very cautious giving a startup money when they’re yet to deliver anything.