I wouldn't scoop out any of the krausen. You could:
1) clean and sanitize your airlock and put it back on
2) lay the lid loosely on the bucket, so that CO2 and krausen can escape if necessary
3) put the fermenter inside some other waterproof container, like a rubbermaid bin, so you don't have to worry about the clean up if the krausen comes pouring out of the bucket
4) when the danger passes, push the lid back down tight
You might do a quick search for 'blow off tube' - basically you replace your airlock with a long piece of tubing that goes from the fermenter to a large container full of water, it works as an airlock, but if you get overflowing krausen, it just goes out the tube into the container, rather than stopping up your airlock and exploding your bucket lid. I didn't think blow off tubes were usually needed on buckets (with lots of headroom), but those of us who use carboys use them often (I use it on every brew).