Join Date: Dec 2015
Location: The Very Tip of Lake Michigan
I think that based on what you say you want to do with it, it would be fine for your project. You have indicated that you would not be sawing on or gouging he wood; that it would only serve as the underlayment for a proper UHMW board. With that in mind, you could easily seal a pine top quite well that, as long as it isn't breached, would reject any stray juices that could infiltrate the fibers. Simply wipe it clean.
I agree with everyone that if you were going to actually use the board as a cutting surface, a soft, open grain wood would not be preferable. But our grandparents and before most all used wooden boards, and rarely ever killed the family with dinner.
I have an absolutely gorgeous 26" x 60" butcher block center island of maple and walnut that you couldn't force me cut on, even if you held a gun to my head! It is purely decorative. I keep it well oiled and always use a plastic board (the little thin ones) on top. The thin cutting boards are cheap enough that I replace them rather frequently.
I vote go for it if that's your material of choice and/ or your budget.
Another $000,000,000.02 worth of advice,