Had my airlock blow out

I made a batch of coffee roasted porter and pitched in the yeast, which I used a starter. Well between midnight and 9am it blowed out, there was porter on the bucket the 3 gallon carboy was sitting on and still some in the air lock. I figured with the pressure being elevated still and with minimal air access that I could refill the airlock with vodka and let it finish working for the rest of the three weeks. If I see any scum on top or cloudy build up, I know it got a bug.

Is my course of action sensible?

You'll be fine. People have blowoffs all the time. I personally always use a blowoff tube for the first few days of fermentation just in case.

I think I'll make a blow off rig with tubing and a sterilized quart jug for future batches and save the airlocks for referments in five gallon buckets.