Sure there is. The Polish Navy could practice finding the pipeline as much as they want. They could also practice blowing things up underwater as much as they want. Doing both at once isn't much more of a problem.
Also I think the backlash issue is overstated, particularly for America. What would Germany do, rage-quit NATO? Not a chance. Get pissy about it but do nothing? Very likely. Bury the evidence so they don't have to explain it to their public? Also very likely. In this regard, America has much more leeway than Poland.
I don't think rage-quitting NATO would be the concern, but a trade war. The US bombing the pipeline is like a tariff applied outside their borders, you can't firmly discount the possibility that someone would take issue with it. Is it likely? Honestly I doubt it, but for the US to benefit western Europe would definitely need to crack come winter (which is by no means guaranteed), and it would be have to be easier to import from America than from Russia even if they did, which isn't obvious. If the US had the capacity to sell enough gas to Europe to profit from this, they wouldn't be worried about energy-hungry nations breaking the embargo!
Well, the US literally did have a practice round, but I don't think their benefit outweighs the potential backlash either. Russia really doesn't risk backlash, but on the first order seems more harmed than not. Maybe it would force Europe to reckon with a winter without Russian gas before the winter comes? Seems pretty flimsy.