Velvit oil is a wiping varnish, I would skip it. Make your own finish using pure tung oil and citrus solvent. Both ingredients are natural ingredients and tung oil is FDA approved, but a pain if not diluted. Citrus solvent is 98% citrus oils and 2% water. Someone on THO gets pure tung oil and dilutes it for his calls, maybe he will chime in as to where and what percentages.
What ever you use, you have to be aware of the fact you will have to refurbish the countertop every so often. In other words wood countertops look super nice but are a life long pain in the butt to the one that has to take care of them. Then there are the other people that visit, you and your wife won't cut on the countertop, but you can bet a guest will not think about that. A knife slice/cut is a pain in the butt that will you will see forever, even after you fixed it.
Marvin