Should I doOwner Financing until I'm able 2 assume sellers loan?

[Nikki Cummings]

I currently have a verbal agreement from the seller to purchase his home for 90K. He holds a VA loan with 4% that I'd like to assume-- although NationStar/USAA says the process could take 3-6-9 months. Of course the seller does not want to wait. Best rate I can currently get is 5.375 on a 30 yr conventional. I hate to let 4% get away from me. This would be a buy and hold rental. Any suggestions on how we can do the deal now? Owner financing until paperwork is complete and loan is in my name? Extra closing costs with this option? Additional risks? Thank you!