How would you attach them without having a seam open up and rapidly decompress? For something like concrete you might be able to do something like drill some holes for an anchor plate, attach the plate (with a hole in middle), plaster around the edges (or use glands), and then weld on a pipe with an isolation valve that you can insert your drill into to start the process. I'm not quite sure anything like this has been developed for an animal. Maybe you could shave off some of the skin, mate a contoured plate with lots of glue, and then drill in a vent through the isolation/throttle valve? It might work. Or the glue might break off and the entire whale would explode.
My recommendation: dynamite. The Oregon whale explosion showed what was above the upper acceptable limit for dynamite per whale. Use just a little less. Or more (maybe there is more than one range for acceptable limits). What I'm saying is that we need to experiment with dynamite every chance we get. For science.